Motion and Time CBSE Class 7 | Motion and Time Important Question and Answers

 Important Question and Answers Motion and Time

A.Give One Word Answers
Q1.Which is the most accurate watch?
 Ans.Atomic watch

Q2.S.I unit of time is
Ans.Second

Q3.Speed time graph is a straight line for
Ans.Uniform motion

Electric Current and its Effects CBSE Class 7 | Important Question and Answers

 A.Short Answer Questions


Q1.What is the filament of electric bulb made up of
Ans.Tungsten

Q2.What is MCB Stands for
Ans.Miniature circuit breaker

Q3.Which device is used to measure electric current
Ans.Ammeter

Q4.Electric current is the flow of________
Ans.Electron

Q5.Which metal is best conductor of electricity
Ans.Silver

Q6.A Device which prevent or allow the current to flow through it
Ans.Switch 

Q7.When two or more cells are joined together it forms a
Ans.A Battery

Q8.Fuse wire is made up of alloys of
Ans.High melting point

Q9.Coils of heating devices are made up of
Ans.Nichrome

Q10.Wire carrying current produce
Ans.Heating and magnetic effect

Q11.Connecting many appliances with single circuit m ay lead to_________
Ans.Overloading

B.Long Answer Questions 

Q1.What is short-circuiting? How it occurs?
Ans.When live wire and neutral wire come in contact of each other short circuiting occurs. During this, heat is developed in circuit and melts the conductor. Connecting many appliances with single socket may also causes short circuiting.

Q2.What is electromagnetic induction? Write its applic ation.
Ans.The process by which electric current is induced by moving a conductor in magnetic field of a magnet. Electric generator is based on p rinciple of electromagnetic induction to produce electric current.

Q3.What are the uses of Electromagnet
Ans.Electromagnet is used:
a. Lifting heavy items of iron and steel.
b. To separate iron scrap from garbage.
c. Used by surgeon to remove tiny iron splinters from wounds.

Q4.What is electric bell? Name its main components.
Ans.An electric bell is a simple device which uses an e lectromagnet to produce sound. Some of the important components of an electric bell are
a. An electromagnet
b. An armature
c. Gong
d. Hammer

Q5.What is a difference between open and close Circuit
Ans.Closed circuit is a circuit in which current is flo wing and switch is in closed position. On the other hand, in open circuit curren t do not flow and switch is in open condition.

Q6.What is an Electromagnet?
Ans.When a soft iron piece is placed into the solenoid having current flowing through it. The iron piece behaves like strong magnet. This magnet is called electromagnet.

Q7.Why do we use nichrome in an electric heater?
Ans.Nichrome is an alloy having high resistivity. The m elting point of nichrome is also very high. So, nichrome is used as coil in electric heat er.

Q8.Write difference between a cell and a battery?
Ans.Fuse is a safety device made up of alloy having low melting point. It is connected in series in the circuit. It protects the circuit and electrical appliances in case of excess of current in the circuit.

Q9.Write difference between a cell and a battery?
Ans.A cell is a device that creates potential differenc e in the circuit to flow the current in the circuit. Combination of two or more cell in ser ies is called a battery.

Q10.What is electromagnetic effect of electric current?
Ans.When electric current flows through a conductor, ma gnetic field is produced around the conductor. This effect of current is called mag netic effect of electric current.
Q11.What is electric current? How its flows?
Ans.The flow of current through a conductor is called e lectric current. Electron flows through the conductor due to potential difference.

Q12.What is different between electromagnet and permanent magnet
Ans.Electromagnet lose its magnetic property as soon as current is stopped flowing. Permanent magnet does not require current to show m agnetic effect. Strength of electromagnet is more than permanent magnet.

Electric Current and Its Effects Class 7 CBSE Science

 Important Notes of Magnetic Effects of Electric Current
Electric Current:
Flow of electrons through a conductor. 
•It is convenient to represent electric components by symbols. Using these, an electric circuitcan be represented by a circuit diagram. 

Outcomes of Democracy Class 10 SST

Important question and Answers of Outcomes of Democracy

Q1.‘It is said that democracy is a rule of the majorit y. The poor are in majority. So democracy must be a rule of the poor’. Justify the answer with suitable arguments.
Ans.No it is not justified, because the rule of majorit y does not mean the rule of people who are in majority in number. If the number of poor pe ople in India is more it does not mean that the rule should be of poor. The majority means that the rule of majority government. The political party who won maximum num ber of seats can form government if political party is able to prove its majority in the house.

Q2.What do you mean by civil liberties?
Ans. The term civil liberties denotes freedo ms or rights which are thought to be especially valuable in themselves and vital to the functioning of a liberal and democratic society. Civil liberties comprise the following freedoms:
A. Freedom of speech and expression.
B. Freedom of religion and thought.
C. Freedom to form association and freedom to move.
D. Legal liberty or freedom to a fair trial.

Q3.Why do people prefer democracy? Explain with four reasons
Ans.A. Democracy promotes equality among citizens.
B. Democracy enhances dignity of individuals.
C. Quality involves in decision making.
D. Democracy provides acceptable method to resolve con flict.

Q4.How does democracy leads to peaceful and harmonious life among citizens in political sphere?
Ans.A. Democracy provides a conducive political environmen t to citizens for their popular participation in politics B. Every adult citizen has the right to vote and right to contest. C. Every citizen can form political party.

Q5.How does democracy leads to peaceful and harmonious life among citizens in economic sphere?
Ans.A. Democracy stands for equal economic status to all c itizens.
B. In democracy every citizen has right to do any prof ession.
C. In democracy government undertakes extensive social welfare schemes and achieve universal economic growth rate.
D. Democracy government took so many welfare schemes t o remove poverty.

Q6.How does democracy leads to peaceful and harmonious life among citizens in social sphere?
Ans.A. In the social sphere democracy tries to help its ci tizens to lead a peaceful and harmonious life by accommodating various social div isions and providing social equality to its citizens.
B. Democratic government tries to resolve differences, respect differences and try mechanism which can negotiate differences.
C. It is also a form of society as well as a social or der which promotes dignity and freedom of the individual.

Q7.Which factors sustain democracy in India?
Ans.A. Democracy is based on the principles of equality, l iberty and brotherhood. To achieve the prescribed goal the framers of our constitution adopted the aims like secularism, socialism democratic republic.
B. The framers of our constitution provided for a repr esentative democracy in a liberal framework in order to sustain democracy.
C. In our country there are periodic elections for all levels of the government.
D. All elections are based on secret ballot and univer sal adult franchise.
E. Our Constitution has given complete liberty to pres sure and other organized or unorganized

Q8.How do we assess democracy’s outcome?
Ans.We assess democracy’s outcome on the basis of its comparative outlook and socio- economic and political achievements like:
A. Comparative analysis between democracy and dictator ship.
B. It provides accountable, responsible, representativ e and legitimate government.
C. It develops mechanism for the people’s participatio n in the decision making process.
D. It promotes economic development. At the same time democracy has the characteristics of economic inequality and disparit ies.
E. We can also assess its outcome on the basis of the way it accommodates the social diversities.
F. It also promotes dignity and freedom of the citi zens.

Q9.How is democratic government known as responsive go vernment? Explain.
Ans.A. It produces a government that is accountable to the citizens, and responsive to the needs of and expectations of the citizens.
B. Democracy is based on the idea of deliberations and negations.
C. Democratic government is attentive to the needs and demands of the people.
D. A government which is able to respond to grievance faster is able to avoid confrontation and provide good governance.

Q10.Why is democratic government known as legitimate go v ernment?
Ans.A. A democratic government is called legitimate govern ment because it is people’s own government.
B. There is an overwhelmingly support for the idea of democracy all over the world.
C. People wish to be ruled by representatives elected by them.
D. Democratic government is attentive to the needs and demands of the people

Q11.How does democracy accommodate social diversities?
Ans.A. It reduced the possibility of tension.
B. It evolves mechanism to negotiate the differences.
C. It expands democratic rights to minority and weaker section of society.
D. It ensures the dignity and equal rights to all its citizens.

Q12.How democracies are based on political and economic equalities?
Ans.A. All citizens have equal role in electing representa tives.
B. Parallel to the process of bringing individuals int o political arena, we find growing economic inequalities.
C. Democracy does not appear to be very successful in reducing economic inequalities.
D. The ultra rich enjoy a highly disproportionate shar e of wealth and income.
E. At the bottom of the society, the people have very little to depend on. It is very difficult to meet their basic needs of life, such a s food, clothing, house, education and health

Q13.How far it is correct to say that democracies have not been able to reduce poverty?
Ans.A. The ability of democracy to achieve higher developm ents worries us.
B. Democracies do not appear to be very successful in reducing economic inequalities. Although majority of voters constitute the poverty ridden group, yet democratically
elected government do not appear to be as keen to a ddress the question of poverty as we would expect them to.
C. The situation is much worse in some other countries .People in several poor countries are now dependent on rich countries even for food

14.List any three reasons in support of the statement that democratic government is better than its alternatives.
Ans.A. A democratic government is people’s own government. That is why it receives overwhelming support from all over the world.
B. People wish to be ruled by representatives elected by them.
C. Democratic government is legitimate government.
D. Democracy’s ability to generate its own support is itself an outcome that cannot ignored.

15.Democracies lead to peaceful and harmonious life am ong citizens.” Support this statement with suitable arguments.
Ans.A. Democracy develops a harmonious social life. Democr acies accommodate various social divisions.
B. Democracies usually develop a procedure to conduct their competition. This reduces the possibility of these tensions becoming explosiv e or violent.
C. In democracies people learn to respect the differen ces and also evolve mechanism to negotiate the differences.
D. The majority always needs to work with the minority so that government functions to represent the general view.
E. Democracy has ability to handle social differences, divisions and conflict

16.Do you believe that democrac y can reduce economic disparities? Give reasons to support your answer.
Ans. Yes, this is far of following reasons;
A. A democracy believes in equitable distribution and makes efforts to serve the poor at the root level.
B. A democracy believes in providing equal opportunit y to all. Democratic governments have been supporting poor people throug h various schemes to uplift their economic level.
C. Poor people are being provided food and shelter at a subsidized rate and also free medicines and treatment facilities.
D. They are being insured for any unhappenings so that their families do not get crushed.
E. They are being provided free education, reservation in educational institution and government jobs, etc.

17.“Transparency is the most important feature of demo cracy.” Analyze.
Ans.. Democracy ensures that decision-making will be base d on norms and procedures.
B. So, citizens who want to know if a decision was tak en through correct procedures can find this out.
C. The people have the right and the means to examine the process of decision- making. This is all what transparency is meant for

Q18.Why is it said that democracies are not free from e vils? Explain.
Ans.A. Most democracies fall short of elections that provi de a fair chance to everyone and in subjecting every decision to public debates.
B. Democratic governments do not have a very good reco rd when it comes to sharing information with citizens.
C. Democracies often frustrate the needs of the people and often ignore the demands of a majority of it population.

Q19.‘Democracies always respond to the needs of people’ . Analyze the statement.
Ans.A. In a democracy the government is known a responsive government as it responds to the needs of the people.
B. A non democratic government may and can respond to the people’s needs, but it all depends on the wishes of the people who rule.
C. A democracy requires that the rulers have to attend to the needs of people. A democratic government is a better government becaus e it is a more accountable form of government.
D. In a democracy there is always a space for public d iscussion and a room for correction.

Q20.Do you agree with the outcome of democracy that it proves to be a better government regarding economic growth of a country? Explain.
Ans.A. It is true that during last 50 years dictatorship h ave shown slightly higher rate of economic growth in comparison to many democracies.
B. But we all know that there are many other factors t hat determine that economic growth of a country like- population size, global s ituation, cooperation from other countries, economic priorities adopted by the count ry etc.
C. So even when there is nominal difference in the rat e of economic growth between countries under dictatorship and democracy, it is b etter to prefer democracy as it has several other positive outcomes like dignity an d freedom of citizens.

Q21.Why is a democratic government considered less effi cient? Give any three re asons.
Ans.A. Deliberations and discussions in the legislature co nsume lot of time. B. The fear of majority and public opinion is a big ob stacle in the efficient working of the government. C. Deliberations and negations cause delay in taking d ecisions or getting the plans executed. This also adversely affects efficiency.

Q22.Has democracy led to the development, security and dignity of the people?
Ans.Democracy stands much superior to any other fo rm of government. Democracy promotes dignity and freedom of the individuals. Th e passion for respect and freedom are the basis of democracy. This has been achieved in various degrees in various democracies. We can take the case of dignity of wom en. Most societies across the world were historically male dominated societies. L ong struggles by women have created some sensitivity today. On the other hand, in non-democracies, individual freedom would not have legal and moral support. Dem ocracies in India have also strengthened the claims of the claims of the disadv antaged and discriminated castes for equal status and equal opportunities. Perhaps i t is the recognition that makes ordinary citizens values their democratic rights.

Q23.“Corruption is a serious problem faced the Indian D emocratic System”. Explain.
Ans.Due to the following reasons we can say that c orruption become serious problem for Indian democracy.
A. It has now become an accepted fact that leaders use money to win favour of the votes. This reason lessens the very sprit of democr atic values.
B. There is an ever increasing tendency among the poli tical parties to give tickets to those who are rich. The parties think that they cou ld win not only their own seats but also help the party monetarily.
C. Now scams by leaders and governments have become a routine tale in the Indian democracy. Many of the popular leaders are facing t rials for corruption charges against them.
D. It has been seen that the wards of the prominent le aders of party easily get tickets for election. The party workers keep serving for years but sometimes outsiders get tickets.
E. It has now become a traditional in many of the popu lar political parties that the chair is inherited.
Q24.How do people take part in decision making in democ racy? Explain.
Ans.A. Decisions are made by the representatives elected b y the people. These representatives represent the ideas and opinions of those voters who have elected them to take decisions on their behalf.
B. In a democracy, people want to know if a decision w as taken through correct procedure, can find this out. In this way, they hav e some degree of control over the whole process of decision making.
C. In a democracy people have the right and mean to ex amine the process of decision making.
D. Sometimes important issues are put forward by the g overnment for public debate before a decision is taken.
E. Demonstration, movement, pressure groups, etc. prov ide means in the hands of people to influence decision making.

Q25.How can we measure democracy on the basis of its ex pected outcome?
Ans.o measure a democracy on the basis of its exp ected outcomes we have to observe the following practices and institutions like
A. In a democracy free and fair elections should be th ere.
B. Open criticism and debate on major policies and leg islations.
C. Citizens right to information about the functioning of government.
D. Whether the democracies are providing a fair chance to everyone, to participate in elections and decision making process
Q26.What is meant by an accountable, responsive and leg itimate government? Explain.
Ans.Accountable: A democratic government develops mecha nism for citizens to take part in decision-making process. For this free and fair ele ctions, open debate on major policies, legislation, Right to information- such rights are given to the citizens. Responsive: Democracy is a responsive government. I t is responsive towards the needs and expectations of the citizens. It takes care and makes policies for the welfare of the citizens.
Legitimate: A democratic government is a legitimate government. It is elected by the people and people wish to be ruled by the represent atives elected by them

Q27.“Any imperfection in the government functi ons is blamed on democracy”. Is it right?
Ans.Every individual expects a lot from democracy. Democracy is expected to solve all the socio-economic, political and economic problems of the country. Democracy is expected to give equality of status to every citize n. It is expected that there would not be any type of discrimination on ground of gender, race, religion or region. The reality is that everything is expected out of democracy. An y imperfection in any such area is termed as undemocratic. It should be realized that democracy is a form of government that creates conditions which will ensure quality o f citizens before the law of the country. But the citizens have to know their rights and freedom and they should try to enforce them. A democratic set up does not ensure a ll the right policies. Individuals have to take advantage of the good conditions creat ed by democracy and make good policies. Thus it is not right that any information in any area is thrown on democracy.
Q28.Why we felt that democracy is a better form of Gove rnment? Give reasons
Ans.A. It promotes equality among citizens.
B. It enhances the dignity of the individuals.
C. It improves the quality of decision making
D. It provides a method to resolve conflict.
E. It allows room to correct mistake.

Q29.What outcomes can one reasonably expect of democrac y?
Ans.A. In the political sphere- Right to vote, Right to co ntest elections.
B. In the economic sphere-Minimized Economic inequalit ies.
C. In the Social sphere-Equal protection to women, SCs , STs, OBCs.

Q30.Are democracies based on political and economic equ alities? Explain.
Ans.A. All citizens have equal role in electing representa tives.
B. Parallel to the process of bringing individuals int o the political arena, we find growing economic inequalities.
C. Democracy does not appear to be very successful in reducing economic inequalities.
D. The ultra-rich enjoy a highly disproportionate shar e of wealth and income.

Q31.Democracy means delay in the decision making. Which one is preferable - quick decision making process of dictatorship or slow dec ision making process of democracy?
Ans.Democracy involves debates and deliberations in the parliament before making a law. The views of all the members of parliament are take n into consideration before taking the final decision. Dictatorship means decisions ta ken by one person or one party. Different views of other members of the government or public are not considered. Democracy means delay in the decision making proces s as the debates take a long time. It means that the implementation will also take tim e. Dictatorship means quick decisions. But those decisions are orders of the go vernment and people are not allowed to disagree with them. Even citizens are not suppos ed to criticize the decisions made by the government. Democracy is better even if it take s more time in making the decisions. At least, the views of the citizens are considered and they are not ordered to just follow them. Individuals can disagree with the policies of the government and show their protest against the government.

Q32.How can democracy accommodate the dignity of women and caste discrimin ation in one system?
Ans.In case of dignity of women, most societies across the world were historically male dominated societies. Long struggles by women have c reated some sensitivity today that respect to and equal treatment of women are ne cessary ingredients of a democratic society. That does not mean that women a re actually always treated with respect. But once the democratic principle is recog nized, it becomes easier for women to wage a struggle against what is now unacceptable legally and morally. Democracy in India has strengthened the claims of the disadva ntaged and discriminated castes for equal status and equal opportunity. There are insta nces still of caste-based inequalities and atrocities, but these lack the moral and legal foundations. Perhaps it is the recognition that makes ordinary citizens values the ir democratic right.

Heredity and Evolution Class X Important Question and Answers

Science class 10 Heridity and Evolution

1.Why acquired characters are not inherited?
Ans.Acquired traits are those which are dev eloped in the organisms during their life time. They are not inherited to next generations. These traits are because of non- reproductive tissues, so cannot be passed.

2.How is the chromosome number restor ed in zygote?

Ans.Gametes (male and female) have N number o f chromosomes. During fertilization gametes fuse and forms zygote. Zygote retains 2N nu mber of chromosomes.

3.What are variations? Give their types.
Ans.Although offspring of the same parents re semble one another as to their parents, yet three are differences among them. These differe nces are called variations. It is of two types- (a) Reproductive- Passed from one generation to another . (b) None reproductive- Not passed from one generation t o another.


4.Write difference between Autosomes or Allosomes.
Ans.

5.State the evolutionary force which leads to origin of a new species.
Ans. Various elemental forces of evolution are- (a) Mutation (b) Recombination (Crossing over during meiosis, Random assortment of gene at the time of gamete formation). (c) Natural selection or survival of the fittest. (d) Genetic drift
6.What is a fossil? How do fossils tells us about the process of evolutions?
Ans. The dead remains of former living organ isms are called fossils. The branch of biology which deals with the study of fossils is ca lled paleontology. The study of fossils tells us that species arose from previously existing ones or that the evolution has occurred in nature and is still conti nuing.

7.Who disproved Lamarckism and how?
Ans. The concept of inheritance of acquired character of Lamark was disproved by August Weismann. He cuts the tail of rat at the tim e of birth and continued this for 21 generation. But tailless rats were never bor n. This trait do not change the DNA of germ cells so cannot be inherited. Hence, th e changes in non-reproductive tissue of an individual during its lifetime cannot be passed on to its progeny, and cannot direct evolution.

8.Give the basic features of the mechanism of inheritance.
Ans. Basic features of mechanism of inherit ance- (a) Each character is controlled by a pair of factors. The factors may be similar or dissimilar. (b) When two dissimilar factors of a character are pres ent in an organism, only one expresses itself while other remains unexpresse d. (c) Two factors of a character are separated at the tim e of gamete formation and get only one factor for that character. (d) Inheritance of two or more pairs of contrasting tra its in such a way that one pair of contrasting traits is independent of the ot her pairs of contrasting traits.
9.Give difference between diploid and haploid

Ans.

10.Mention two sources of variation.
Ans. (1) Errors in DNA copying.
(2) Random fertilization.

11.What is monohybrid and dihybrid cross?
Ans. Monohybrid cross- It is the simplest cross in which inheritance of one character is studied. A cross is made between the pair of pla nts having one contrasting character such as tall or dwarf.
Dihybrid cross- A cross made be tween two plants having two pairs of contrasting character is called dihybrid cross. For ex. round a nd green seed crossed with yellow and wrinkled seed.

11.Why did Mendel choose pea plant for his experimentation?
Ans.Mendel selected garden pea for his ex periment for the following reasons- (a) The life span of this plant is very short so result s can be obtained and studied faster. (b) Garden pea has many characteristics which are in co ntrast to each other. (c) Moreover this plant is small, easy to grow and repr oduce large number of offsprings.

12.How does Archaeopteryx provide evidence for organic evolution?
Ans. Archeoptyrx has some features of repti les, characters of dinosaurs as well as some features of birds like wings. This shows that birds are closely related to reptiles. Birds could evolve from reptiles.

13.What is divergent evolution? Explain with the help of example
Ans. The formation of dissimilar looking or ganisms from common ancestors is called divergent evolution. This is also known as adaptive radiation which represents evolution of new forms in several directions from t he common ancestors type. The current example of such a process is the evolut ion of wild cabbage. For over more than 200 years, humans have cultivated wild ca bbage as a food plant and generated different vegetables (like cabbage, brocc oli, cauliflower, kohlrabi and kale etc) from it by different artificial selection s. Thus all these structures of different vegetables are descended from the same an cestor i.e. wild cabbage.
14.What is the difference between reproductive and non - reproductive variations ?
Ans.

15.Write similarities between Mendalian’s factors and gene.
Ans. Mendel proposed the inheritance of trait s from parents to offsprings by hereditary units called factors. Mendel suggested t hat every character is controlled by a pair of factors. Sutton and Boveri (1902) found striking similarities between the behaviours of Mendelian fa ctors and the chromosomes during meiosis and fertilization. Factor and chromo somes are present in paired condition in the parents, seprate during meiosis an d again get paired after fertilization.

16.What is emasculation? Why is it done?
Ans. Removal of anther to avoid pollination in experimental plant is called Emasculation.

17.What is gene? Where are genes located?
Ans.Segments of DNA are called gene. Genes are located on chromosomes.

18.How many contrasting characins did Mendel see in garden pea? Give any two of them.
Ans. Mendel observed seven contrasting charact ers is pea plant. For Ex- flower position- axial an d terminal. seed shape- round and wrinkled.

19.Give difference between homologous and analogous or gans.
Ans.

20.State three law s of Mendel.
Ans. Mendel’s law- (A) Law of dominance- when two dissimilar factors of a character are present in an organism only one expresses itself (dominant fac tor) while other remain unexpressed (recessive factor)
(B) Principle of segregation – two factors of a charact er are separated at the time of gamete formation and each gamete gets only one f actor for that character.
(C) Principle of independent assortment- this principle states that inheritance of two or more pair of contrasting traits is such a w ay that one pair of contrasting traits is independent of the other pair of contrasting traits.

21.Describe how the sex of the offspring is determined is the zygote is human beings?
Ans.The males can produce two types of game tes, either X-type or Y-type. The females produce only one type of gametes or ova, X-type. If X-type sperm fuses with the ovum, then the sex of the baby will be female. If Y -type sperm uses with the ovum, then the sex of the baby will be male. Sex of the b aby is decided at the time. Sex of the baby is decided at the time of fertilization.

22.Give a suitable explanation for “geographical isol ation of individual of a species lead to formation of a new species?
Ans. Reproduction barrier such as river (geogr aphical is olation) between the sub population leading to: a) Genetic drift or random changes in the gene frequen cy by chance alone e.g. selection of red or blue beetles instead of green i n presence of crows. b) Natural selection or selection of the fittest by na ture itself eg. Selection of green beetles instead of red ones in the presence o f crows.

23.( i ) Who provided the evidence of DNA as genetic materia l?
(ii) Why DNA is called polynucleotide. (iii) List three important features of double helic al model of DNA.
Ans.
(a) Mendel.
(b) DNA is made up many units o f nucleotides. (c) Important features- (1) Both the chains in helical runs anti-parallel.
 (2) There two nitrogenous base Purine (A, G) and pyrimidine (T, C).
 (3) A always bind with T an d C always binds with G.

24.Why acquired traits are not inherited?
Ans. Acquired traits are those which are devel oped in the organisms during their life time. These traits are because of non-reproductive tissue, so cannot be passed.

25.How evolution and classification are linked?
Ans. Classification is the arrangement of organi sms into groups on the basis of their characteristics. Characteristics are details of app earance or behaviour. Classification based on evolution is considered the most advanced and effective. The classification of organisms/ species into groups is a reflection o f their common ancestors and hence evolutionary relationship also.

26.What are coacervates?
Ans. First life molecules which are formed due to formation of membrane around amino acids, sugars and nitrogenous bases aggregates are called coacervates. Further development in coacervates leads to origin of life.

27.How do the two factors for a character, present in diploid cells, behave at the time gamete formation?

Ans. Two factors called X and Y, segregate durin g gamete formation. Hence gamete is either X or Y.
28.Only variations that confer an advantage to an indi vidual organism will survive in a population. Do you agree with this statement? Why or why not?

Ans.Variations that confer an advantage to an individual organism may or may not survive in the population depending upon the social behaviour of the organism. A variation in a social animal like ant may not survi ve in a population while a variation in an animal like a leopard may survive.

29.What are the different approach es to determine evolutionary history of man?
Ans. To construct evolutionary history of man , there are three approaches- (1) Historical method- It gives direct evidence in the form of fossil records. The age of fossils can be determined by carbon dati ng methods.
(2) Comparative method- By comparing several exis ting forms, we can makes ideas about their common ancestors and reconstruct their about possible history.
(3) Analytic method- By observing present day human be ing vestigial organs and by studying the development pattern from embryo to adult.

30.What is fossilization? How are fossils formed?
Ans.The process of fossils formation is calle d fossilization. Fossils are formed when organisms die; their bodies get decomposed and lost . Sometimes the body or a part of it may be in such an environment that it does no t let it decompose completely. The mud will eventually harden and retain the impre ssion of the body parts of the organism. This mud with the impression will be call ed fossil of the organism.

31.What are homo lo gous and analogous organ? Explain with the help of example.
Ans.Homologous organs are those which have si milar basic structure and origin but may have different functions. For example- Hands of human bein gs and wings of birds. Analogous organs- Organs which ha ve different basic structure and origin but have similar function are called analogous organs. For example- (1) wing of bat an d wing of bird. (2) wing of birds and wing of insect.

32.Give the pair of contrasting traits of the followin g characters in plant and mention which one is recessive and which is dominan t? (a) yellow seed (b) round seed

Ans. (a) Green seed- Dominant Yellow seed- Recessive (b) Wrinkled seed – Recessive Round seed- Dominant

33.Mention two important features of fossils which hel p in evolution.
Ans. (a) Fossils provide direct evidence o f evolution
 (b) Fossil records also provid e missing links between two groups of organisms, for example- Archaeopteryx.

34.What do you understand by the term natural selection?
Ans. According to theory of Natural selectio n, Nature select fittest animal for animal those who not fit, are eliminated by nature itself

35.Differentiate between convergent and divergent evol ution.
Ans.

36.What are the different ways in which individuals wi th a particular trait may increase in a population?
Ans.The factors which are responsible for rai sing a new species are selection of environmental conditions for survival of a particul ar species. If a variation occurs in a population and that variation results in bette r survival of the organism in the prevailing natural conditions, then the trait would be selected naturally and more in the population.

37.What are the different theories about origin of life?
Ans.(a) Theory of special creation- According to this theory the almighty god created life. (b) Theory of spontaneous generatio n- According to this theory, life originated from non-living materials by the process of a bioge nesis wring mud, decomposing matter, sun, air and water, etc. (c) Cosmozoic theory- It states tha t life came to Earth from some heavenly bodies in the form of spores or seeds. (d) Biogenesis- This theory states that life originated from pre-existing life. (e) Modern theory of origin of life - According to this, complex organic molecule was formed from simple inorganic molecules only in suitable condition.

38.What is the difference between chemical evolution and organic evolution?
Ans.

Nationalism In India Class X History Important Question and Answers

Nationalism in India

Important Question and Answers 
1. Who was the leader of the peasants in the Gudem Hills of Andhra Pradesh?
Ans.Alluri Sitaram Raju
2. Which pact reserved seats for Dalits in the provincial and central legislative assembly?
Ans.Poona Pact
3. Which political party formed within the congress to argue for return to council elections?
Ans.Swaraj Party
4. Why did Gandhiji begin fast unto death when Dr B. R. Ambedkar demanded separate electorate for Dalits?
Ans.Separate Party
5.Name the leaders that formed the Swaraj Party?
Ans.Motilal Nehru And C.R Das
6 In which year did Gandhiji decided to launch a nationwide Satyagraha against the Rowlatt Act? Ans.1919
7. In which year was kheda Satyagraha organized?
Ans.1917
8. Name the object which was found to be a powerful symbol according to Gandhiji that could unite the nation.
Ans.Salt
9.Name the place where Non Cooperation movement was called off?
Ans.Chauri Chaura 10. When was police fired in united province at peasants near Rae Bareli?
Ans.on 6th january 1921 11. In which year Ahmedabad mill worker’s Satyagraha was organized?
Ans.1918 12. Name the rebel leader of tribal people of Andhra Pradesh?
Ans.Alluri Sitaram Raju
13.When and where second round table conference was held?
Ans.The second round table conference was held at London in December 1931
14. Name the party which was formed by C.R. Das and Motilal Nehru?
Ans.Swaraj party
15. Name the flag which was designed by Gandhiji in 1921?
Ans.Swaraj Flag
16. Give a major factor for the emergence of nationalism in India?
Ans.Anti colonial Movement
17.Who was M.R. Jayakar?
Ans.He was member of Hindu Mahasahba, who strongly opposed the efforts of compromise during all Parties Conference in 1928.
18. What is Begar?
Ans.Begar is a type of labour that villagers were forced to contribute without any payment
19. Which name was given by Gandhiji to the Dalits?
Ans.Harijans or the children of God.
20. When and where was the second round Table conference held?
Ans.The second round table conference was held at London in December 1931.
Short Question and Answers
1.Which political solutions were adopted by Dalits leaders to the problems of their community?

Ans.A. Many Dalits leaders were keen on different political solutions to the problems of the community.
B. They began organizing themselves and demanding reserved seats in electoral institutions.
C. They also asked for separate electorate that would choose Dalits members for legislative councils.
 D. They believed, Political empowerment would resolve the problems of their social disabilities.
E. Dr B R Ambedkar organized the Dalits and formed a Depressed classes Association in 1930s.
 F. These voluntary organizations also receive financial support from the government for creating awareness among people.

2.Why did the growth of nationalism in the colonies linked to anti colonial
movement?


Ans.By the end of Nineteenth century anti-colonial Movement in most of the colonies led to
the growth of nationalism. The colonial exploitation led to poverty and caused miseries
to the people. The shared a common hatred against the colonial rule. In colonies the
people began to discover their unity in the process of their struggle against
colonialism. Each section of the society felt the effects of colonialism. The British policy
of racialism and that of divide and rule exposed the nature of their rule and created the
feeling of oneness among Indians. They felt the sense of common hatred against
colonial rule.

3.Why did the Rich peasant communities become active in the Civil Disobedience
Movement?


Ans.A. Rich peasant communities –like Patidars of Gujarat and the Jatts of Uttar Pradeshwere
active in the movement.
B. Being producers of cash crops, they were very hard hit by the trade depression and
falling prices.
C. As their cash income disappeared, they found it impossible to pay the government’s
revenue demand. And the refusal of the government to reduce the revenue demand
led to widespread resentment.
D. Due to this reason rich peasants become enthusiastic supporters of the civil
Disobedience Movement.

4.What was the impact of Infamous Jallianwalla Bhag incident over Society and
British Government?


Ans.A. As the news of Jallianwalla Bagh spread, crowds took to the streets in many north
Indian towns.
B. There were strikes, classes with the police and attacks on government buildings.
C. The government responded with brutal repression, seeking to humiliate and
terrorize people.
D. Satyagrahis were forced to rub their noses on the ground, crawl on the streets, and
do salute to all sahibs.
E. People were flogged and village around Gujranwala in Punjab now in Pakistan were
bombed.

5.Who gave the slogan “Inquilab – Zindabad”? What do you understand by this
slogan?


Ans.A. The famous slogan Inquilab Zindabad was given by Hasrat Mohani. This famous
slogan inspired the activities of the Hindustan Socialist Republican Association
particularly Ashfaqulla Khan, Bhagat Singh and Chandrashekhar Azad.
B. It is a Hindustani phrase taken from Persian which translates to "Long Live
Revolution".
C. It was a common phrase used by revolutionaries during the British rule over India.
D. It was popularized in the activities of the Hindustan Socialist Republican
Association by revolutionaries such as Bhagat Singh and Chandrashekhar Azad,
who used it to urge future generations to endorse, and support the party’s
rebellious actions.

6.Read the passage and write down the answers of given questions:
It is said of “passive resistance” that it is the weapon of the weak but the power
which is the subject of this article can be used only by the strong. This power is not
passive resistance. Indeed it calls for intense activity. The movement in South
Africa was not passive but active……..Satyagraha is not physical force. A Satyagrahi
does not inflict pain on the adversary; he does not seek his destruction…..in the use
of Satyagraha, there is no ill-will whatever.
A. Who is this great man who spoke these words?
B. Name two methods used by him during the struggle for independence?
C. What is Satyagraha?
D. For what purpose the Satyagraha was used by the person named by you
in South Africa?
E. What is difference between physical force and soul-force?

Ans.A. Mahatma Gandhi
B. Satyagraha and Non-Violence
C. It was a non-violence method of mass agitation against the oppressor. The method
suggested that if the cause was true, if the struggle was against injustice, there is no
need for physical force to fight the oppressor.
D. Against injustice and apartheid system in South Africa,
E. Satyagraha is a soul force whereas arms force is a physical force. Physical force
depends upon ill-will while in the use of Satyagraha there is no ill-will.

7.Identify the reasons that why Muslim Political organizations in India were
lukewarm in their response to the civil disobedience Movement.


Ans.A. Some of the Muslim political organizations in India were also lukewarm in their
response to the Civil Disobedience Movement.
B. After the decline of the Non- Cooperation–Khilafat movement, a large section of
Muslims felt alienated from the congress.
C. From the mid-1920s the congress came to be more visibly associated with openly
Hindu religious nationalist group like the Hindu Mahasabha.
D. As relation between Hindus and Muslims worsened, each community organized
religious processions with militant fervor, provoking Hindu-Muslim communal
clashes and riots in various cities.
E. Every riot deepened the distance between the two communities.

8.What is separate electorate? Why do you think Gandhiji was against the demand of
separate electorate by B R Ambedkar?

Ans.Separate electorates are usually demanded by minorities who feel it would otherwise
be difficult for them to get fair representation in government. Separate electorate for
Dalits means that Dalits will choose their separate leader by separate elections for
Dalits.
Gandhiji was against the demand of separate electorate of Dr B R Ambedkar because
he believes that separate electorates for Dalits would slow down the process of their
integration into society

9.Why martial law was imposed in Punjab during the month of April in 1919?
Ans.The martial law was imposed in Punjab because Rowlatt Act was introduced by the
British Government. Against this act rallies were organized in various cities, workers
went on strike in railway workshops and shops closed down. British Government
decided to clamp down on the nationalist leaders. Local leader were picked up from
Amritsar. Mahatma Gandhi was barred from entering Delhi. On 10 April, the police in
Amritsar fired upon a peaceful procession, provoke widespread attacks on banks post
offices and railway stations. Due to this martial law was imposed and General Dyer
took command.

10.Why were  Indians against Rowlat Act?

Ans.A. This Act had been hurriedly passed through the Imperial Legislative Council
despite the united opposition of Indian Members.
B. It gave the government enormous power to repress political activities, and allowed
detention of political prisoners without trial for two years.
C. The Rowlett Act acted as an instrument of suppression of civil rights of the Indians
hence produced widespread discontent among masses.

11.Mention the features of the flag which was designed by Gandhiji?

Ans.A. In 1921 Gandhiji had designed the swaraj flag.
B. It was a tricolor flag and had a spinning wheel in the centre representing the
Gandhian ideal of self-help.
C. Tricolors were-red, green and white.
D. Carrying the flag, holding it aloft, during marches became a symbol of defiance.

12.What were three proposals regarding Non- Cooperation movement, as suggested
by Mahatma Gandhi?


Ans.A. The movement was to be unfolded in stages.
B. It should begin with the surrender of titles awarded by the government and boycott
of civil services, army, police, courts, legislative council, schools and foreign goods.
C. Then, In case the government used repression, a civil disobedience movement
would be launched.

13..Explain the issue behind the Khilafat Movement

Ans.A. The First World War had ended with the defeated of Ottoman Turkey.
B. There were rumors that a harsh peace treaty was going to be imposed on the
Ottoman emperor –the spiritual head of the Islamic world.
C. To defend the Rowllat Act, Mahatma Gandhi felt, to take the Khilafat issue.
D. To bring the Hindus and Muslims closer, he felt, to take the Khilafat issue.
E. Muslim leaders Muhammad Ali and Shaukat Ali began discussing with Gandhiji the
possibilities of a united mass action on the issue.
F. Later at Calcutta Session in 1920, Gandhiji convinced the leaders in congress, to
start a non cooperation movement in support of khilafat.

14.Read the passage and write down the answers
On 6 January 1921, the police in United Provinces fired at peasants near Rae
Bareli. Jawaharlal Nehru wanted to go to the Place of firing, but was stopped by the
police. Agitated and angry, Nehru addressed the peasants who gathered around
him. This is how later described the meeting: “they behaved as brave men, clam an
unruffled in the face of danger. I do not know how they felt but I know what my
feelings were. For a moment my blood was up, non-violence was almost forgottenbut
for a moment only. The thought of the great leader, who by God’s goodness has
been sent to lead us to victory, came to me, and I saw the kisans seated and
standing near me, less excited, more peaceful than I was-and the moment of
weakness passed, I spoke to them in all humanity on non-violence-I needed the
lesson more than they heeded me and peacefully dispersed.”
Quoted in Sarvapalli Gopal, Jawaharlal Nehru: A Biography, Vol.1.
A. Name the Movement during which the police in the united province fired at the
peasants.
B. Name the leader about which Jawaharlal Nehru is talking about.
C. Name the weapons used by the leaders during National Movement for
independence.
D. What was Nehru’s feeling and how did he change them?
E. What is source of the above passage?

Ans.A. Non-Cooperation Khilafat Movement.
B. Mahatma Gandhi.
C. Satyagraha and Non Violence.
D. He was very angry but the thought of Mahatma Gandhi changed his feelings.
E. Quoted in Sarvapalli Gopal, Jawaharlal Nehru:

15.Can you explain why some congress leaders were reluctant to boycott the council
elections of November 1920?


Ans.Many within the congress were, however concerned about the proposals given by
Gandhiji. They were reluctant to boycott the council elections of November 1920
because the feared that the Movement might lead to popular violence. In the months
between September and December there was instance tussle within the congress. For a
while there seemed no meeting point between the supporters and the opponents of the
movement. Finally at the Congress session at Nagpur in December 1920, a compromise
was worked out and the Non cooperation program was adopted.

16.Highlight the effects of Non Cooperation movement on the economy of India.

Ans.The effect of non co-operation on the economic front was more dramatic. Foreign
goods were boycotted, liquor shops picketed, and foreign cloth burnt in huge bonfire.
The import of foreign cloths halved between 1921 and 1922 its value dropping from Rs
102 crore to Rs 57 crore. In many places merchants and traders refused to trade in
foreign goods or finance foreign trade. As the boycott movement spread, and people
began discarding imported clothes and wearing only Indian ones, production of Indian
textiles mills and handlooms went up.

17.What were the methods used by peasants of Awadh to achieve their goal? Explain

Ans.A. In many places nai-dhobi bandhs were organized by panchayats to deprive
landlords of the service of even barbers and washer men.
B. The peasant movement demanded reduction of revenue, abolition of beggar and
social boycott of oppressive landlords.
C. Some peasants denied doing beggar-work without at landlords’ farms without any
payment.
D. As the movement spread in 1921, the houses of talukdars and merchants were
attacked, bazaars were looted.

18.Why was the Non Cooperation movement withdrawn by Gandhiji?

Ans.A. The movement was turning violent.
B. At Chauri-Chaura in Gorakhpur in Uttar Pradesh, a peaceful demonstration in
bazaar turned into a violent clash in which more than 20 policemen were killed.
C. Gandhiji also felt that Satyagraha is needed to be properly trained before they
would be ready for mass movement.

19.How was the Civil obedience Movement different from Non Cooperation
Movement? State any three points of difference
.

Ans.A. Non-cooperation Movement was launched in1920 to 1922, while the Civil
Disobedience Movement continued 1929 to 1934.
 B. The Non-cooperation Movement was launched because of the anger of Jallianwala
Bagh and against Rowlett Act, while Civil Disobedience movement was launched
against the arrival of Simon Commission.
C. The Idea of Non Cooperation include that if the Indians refused to cooperate
British rule in India will would collapse within a year and swaraj would come. But
the idea of Civil Disobedience Movement includes breaking colonial rules and
disobeying the rules.

20.Why was Gandhiji decided to call off the Rowlett Satyagraha?
Ans.A. Gandhiji in 1919 decided to launch a nationwide satyagraha against Rowlett Act
(1919)
B. On 13 April the famous Jallianwala Bagh incident took place. As the news of
Jallianwalla Bagh spread, crowd took to the streets in many north Indian towns.
C. There were strikes, classes with the police and attacks on government buildings.

D. The government responded with brutal repression, seeking to humiliate and
terrorize people.
E. Satyagrahis were forced to rub their noses on the ground, crawl on the streets, and
do salute to all sahibs.
F. People were flogged and village around Gujranwala in Punjab now in Pakistan
were bombed.
G. Seeing violence spread, Mahatma Gandhi called of the movement

21.How did the revival of Indians folklore develop the ideas of Nationalism among
Indians? Explain.


Ans.A. Idea of nationalism also developed through a movement to revive Indian folklore.
B. In late nineteenth century India, nationalists began recording folk tales sung by
bards and they toured villages to gather folk songs and legends.
C. These tales they believed gave a true picture of traditional culture that had been
corrupted and damaged by outside forces.
D. It was essential to preserve this folk tradition in order to discover one’s national
identity and restore a sense of pride in one’s past.
E. In Bengal, Rabindernath Tagore himself began collecting ballades, nursery rhymes
and myths and the movement for folk revival.

22.Highlight the major facts about the new economic situation created by First World
War in India?


Ans. A. First World War led to a huge increase in defense expenditure which was financed
war loans and increase in Taxes.
B. Custom duties were raised and new income taxes were introduced.
C. Through war years prices increased-doubling between 1913 and 1918.
D. Villagers were called upon to supply soldiers.
E. Forced recruitment in rural areas caused widespread anger


23.“Gandhiji saw this as an opportunity to bring Muslims under the umbrella of
unified national movement” Can you explain that opportunity

 Ans.That opportunity was ‘Khilafat Issue’. The First World War ended with the defeat of
Ottoman Turkey. And there were rumours that a harsh peace treaty was going to be
imposed on the ottoman emperor-the spiritual head of the Islamic world (the Khailifa).
To defend the khalifa’s temporal power, a khilafat committee was formed in Bombay in
March 1919. A young generation of Muslims leaders likes the brothers Muhammad Ali
and Shaukat Ali, Began discussing with Mahatma Gandhi about the possibility of a
united mass action on the issue. Gandhiji saw this as an opportunity to bring Muslims
under the umbrella of unified national movement.

24.Can you identify the different limitations of Civil Disobedience Movement?
Ans.. Limited participation of Dalits: Dalits participation in the civil Disobedience
movement was very limited, particularly in Maharashtra and Nagpur region where
their organization was quite strong.
B. No Participation of Muslims: Some of the Muslim political organizations in India
were also Lukewarm in their response to the Civil Disobedience Movement. After
Non-Cooperation-Khilafat movement Muslims felt alienated from the congress.
C. Dominant role of Sanatanis and Hindu Mahasabha: The role of Sanatanis and Hindu
Mahasabha was very dominant. Due to the fear of Sanatanis the conservative high
class Hindus, congress ignored the Dalits. Congress was very close to Hindu
Mahasbha. Hindus Mahasabha strongly opposed the efforts of compromise
between Congress and Muslim League.
D. Clash between BR Ambedkar and Mahatma Gandhi: In 1930 Dr B R Ambedkar
clashed with Mahatma Gandhi at the second round table conference by demanding
separate electorate for Dalits.
E. Participants have different aspirations: Participation had their own aspirations.
There was a contrast between the demands of industrialist and working class.
Contrast was also there in the demand of Rich peasants and poor peasants. United
struggle was not there.

25.What were the main ideas of Gandhiji behind ‘Non Co-operation’?
Ans.Gandhiji in his famous book Hind Sawraj declared that British Rule was established in
India with the cooperation of Indians, and successful only because of our cooperation.
If Indians refused to cooperate, British rule in India would collapse within a year and
swaraj would come. According to Gandhiji it should begin with the surrender of titles
that the British government awarded, and a boycott of civil services, army, police,
courts and legislative councils, schools and foreign.

26.Elaborate the contribution of Allaouri Sita Ram Raju in the nationalist movement
of India.

Ans.A. Alluri Sita Ram Raju claimed that he had a variety of special powers: he could make
correct astrological predictions and heal people, and he could survive even bullet
shots.
B. Captivated by Raju, the rebels proclaimed that he was an incarnation of God. Rajju
talked of the greatness of Mahatma Gandhi, said he was inspired by the Non
Cooperation Movement, and persuaded people to wear Khadhi and giving up
drinking.
C. But at the same time he asserted that India could be liberated only by the use of
force, not non-violence.
D. The Gudem rebels attacked police stations, attempted to kill British officials and
carried on guerrilla warfare for achieving swaraj. Raju was captured and executed
in 1924, and over the time became a folk hero.

27.Why martial law was imposed in Punjab during the month of April in 1919?
Ans.A. Gandhiji in 1919 decided to launch a nationwide Satyagraha against the proposed
Rowlett Act (1919).
B. Rallies were organized in various cities, workers went on strike in railway
workshops, and shops closed down.
C. On April, the police in Amritsar fired upon a peaceful procession, provoke
widespread attacks on banks, post office and railway stations.
D. The British administration decided to clampdown on nationalists. Martial law was
imposed and General Dyer took command.

28.Can you explain why some congress leaders were reluctant to boycott the council
elections of November 1920?

Ans.A. Many within the congress were however, concerned about the proposal of Gandhiji
to start Non Cooperation Movement.
B. They were reluctant to boycott the council elections scheduled for November 1920.
C. They feared that the movement led to popular violence.
D. In the months between September and December there was intense tussle within
the congress.

29.What was the contribution of Natesa Shartri for the revival of folklore and folk
tales? What were his views?

Ans.In madras Natesa Shastri published a massive four-volume collection of Tamil folk
tales, the Folklore of Southern India.
A. He believed that folklore was national literature;
B. It was most trustworthy manifestation of people’s real thought and
characteristics

30.How the plantation workers of Assam interpret Mahatma Gandhiji and the
notion of swaraj?

Ans.Workers too had their own understanding of Mahatma Gandhi and the notion of
swaraj. For plantation workers in Assam, freedom meant the right to move freely in
and out of the confined space in which they were enclosed, and it meant retaining a
link with the village from which they had come. Under the Inland Emigration Act of
1859, plantation workers were not permitted to leave the tea gardens without permission, and in fact they were rarely given such permission. When they heard of
the Non-Cooperation Movement, thousands of workers defied the authorities, left the
plantations and headed home. They believed the Gandhi Raj was coming and everyone
would be given land in their own villages. They, however, never reached their
destination. Stranded on the way by a railway and steamer strike, they were caught by
the police and brutally beaten up.

31.Explain the contribution of Gandhiji to uplift the position of Untouchables in the
society?

Ans.A. Gandhiji declared that swaraj would not come for a hundred years if untouchability
was not eliminated.
B. He called the untouchables Harijans children of God,
C. He organized satyagraha to secure them entry into temples and to assess to public
wells, tanks, roads and schools,
D. He himself cleaned toilets to dignify the work of Bhangi (the Sweepers).
E. He persuaded the upper castes to change their heart and give up the sin of
untouchability.

TAGS:History Important Question class X, Nationalism in India question and Answers, Class X History notes

Speech on Growing Indiscipline Amongst Students

Indiscipline among students has become so rampart that people freely criticize them. Teachers accuse them for want of respect. Parents are dissatisfied with them because they do not get good marks -in the examination and waste time in this and that. And if we talk about the students we see that they are angry with the authorities, they are displeased with their teachers, their parents. Every day we read in newspaper about strikes, incidents of free fighting in educational institutions. Sometimes, these incidents take so u§ly turn that they come under control by police only. At times it also happens that students are put behind bars due to their aggressive activities. What are the causes of this indiscipline? Students are the builders of nation. They are the symbol of creativity. When they indulge in destructive acts what will be the future of our country? Hence, we must sort out the reasons so that they may uproot in order to give a secured present and future to our students. The greatest cause of the indiscipline among students is our defective educational system, where too much stress is given oni on the completion of the text-books within alloted time. As teachers are under pressure of completion of the text-books they just stop to give moral education to their students. As a result, character formation becomes secondary. In absence of value based education, the future of young generation seems to be gloomy. It has been seen that when the youth finish their studies, they are half-educated and ill- paced. This situation promotes unemployment among them. Unemployment promotes depression many of our students are victims of this evil. If we want to uproot indiscipline among our youth class, basic change in the present education system is very important. Nowadays, we see that our youth are getting addicted to television, a main source of spreading indiscipline among students. Violence on television affects children negatively. They become less sensitive to the pain and suffering of others. Not only this, they are encouraged to behave in aggressive ways towards others-whether they are their parents or teachers or relatives. Then comes film today's films dwell more on violence and other crimes which divert young minds Most of the parents today are working and have no time to discuss vital issues with their sons and daughters. They try to compensate for time with money. But money can not help instil good values. The fear barrier no longer exists in our society and parents easily give way to children's repeated demands without realising the consequences. This is a dangerous sign of decadence and anti-social ills. It is very easy.for students to go astray if not guided by their parents and cools. Hence, they must be saved at any cost, for they are the ultimate hope of the nation

Quadratic Equations CBSE Class X Important Questions

1. For what value of k, x=a is a solution of equation x2-(a+b)x+k =0 ?

2.Rohan ‘s mother is 26 years older than him . the product of their ages (in years) 3 years from now will be 360. We would like to find Rohan’s present age.

3.Find the roots of x2-3x-10 = 0

4.Find two consecutive positive integers , sum of whose squares is 365.

5.Find the discriminant of the Quadratic equation 2x2-4x+3 = 0 and hence find the nature of its roots .

6.If x=2 and x=3 are roots of the equation 3x2-2kx+2m find the value of k and m.

7.Solve the equation 2x2-5x+3=0 using completing square method

8.Using the quadratic formula solve the equation px2xx2+(px2 - qx2)x -qx2 =0

9.In a class test , the sum of shefali‘s marks in maths and English is 30. Had she got 2 marks more in maths and 3 marks less in English, the product of their marks would have been 210. Find her marks in the two subjects.

10.Two water taps together can fill a tank in 9 3/8 hours. The tap of larger diameter takes 10 hours less than the smaller one to fill the tank separately. Find the time in which each tap can separately fill the tank.

11.Solve the following equation for ‘x’ 9x2- 9(a+b)x2 + ( 2a2+5ab+2b2 ) = 0

12.If the roots of the equation (a-b)x2 +(b-c)x + (c-a) = 0 are equal , prove that 2a =b+c.

13.A person on tour has Rs. 360 for his daily expenses. If he exceeds his tour program me by four days, he must cut down his daily expenses by Rs 3 per day. Find the number of days of his tour program me.

14.Solve for x: 9x2-6ax+(a2-b2)=0

15. if the equation (1+m2)x2+2mcx+c2-a2=0 has equal roots, show that c2=a2(1+m2)

16.An express train takes 1 hour less than a passe nger train to travel 132 km between Mysore and Bangalore (without taking into consideration the ti me they stop at intermediate stations). If the average speed of the express train is 11 km/h more than that of the passenger train, find the average speed of the two trains.

17.Find the value of k for 4x2 – 2(k + 1)x + (k + 4) = 0, so that it has two equal roots.

18.A motor boat whose speed is 18 km/h in still wa ter takes 1 hour more to go 24 km upstream than to return downstream to the same spot. Find th e speed of the stream.

19.Solve for x: 5x+1 +51-x
 
20.Solve 12abx2-9a2x+8b2x-6ab=0

21.. A takes 6 days less than the time taken by B to finish a piece of work. If both A and B together can finish it in 4 days, find the time t aken by B to finish the work.

22.Determine the nature of the roots of the Quadratic equation 9a2b2x2-24abcdx+16c2d2=0
23.




24.





25.














26.

Quadratic Equations Class X Worksheet

Worksheet of Quadratic Equations Class X Chapter 4












How Do We Reproduce CBSE Class X

Important Notes of How do We Reproduce

Reproduction is the process by which living organisms produce new
individuals similar to themselves.
– Reproduction ensured continuity of life on earth.
– Reproduction - A bridge to hereditary transmission.
– It involves continuation of characters from the parents to daughter cells by
Copying of DNA (Deoxyribose Nucleic Acid) molecules present in the
chromosomes of the cell.
– Copying of DNAs is also not a foolproof exercise, even minute changes bring
about Variation in the blue print of the offsprings.
– The useful variations are retained while the harmful one does not go beyond.
– Actually variations help the species to withstand drastic environmental
changes, thus save the species from becoming extinct and promotes its
survival for a longer time.
– This inbuilt tendency of variation is the "fuel" for Evolution.


– Asexual Reproduction is extremely useful as a mean of rapid multiplication.
It is common in lower plants and animals.
– Different form of Asexual Reproduction.

1. FISSION : the parent cell divides/splits into two daughter cell-Binary
Fission; splits into many cells-multiple Fission




2. BUDDING : A new organism is produced as an outgrowth of the parent
body part.



3. Spore Formation : Spores are
small, bulb like structure develops
at the top of the erect hyphae of the
fungus plant, released into the air
and ge rmina t e , into new
individuals after landing into food
or soil.


4. FRAGMENTATION : It is the accidental process when the broken pieces
of an organism (fragments) grows into a complete organism.

eg. fragmentation in
spirogyra















5. REGENERATION : When the simple animals like Hydra Planaria
develop a new individual from their broken older part it is known as
regeneration. It is carried out by specialised cells which grow large numbers
of cells.


VEGETATIVE PROPAGATION :
A mode of reproduction in which part like the stem, root, leaves develop into new
plant under favourable conditions.
Benefits
1. Plants can bear flowers, fruits earlier than those produced from seeds.
2. Growing Banana, orange, rose, jasmine that have lost the capacity to produce
seeds.
3. Genetical similarity is maintained in the plants.
eg. Sugarcane, rose, grapes by layering or grafting.


SEXUAL REPRODUCTION
When reproduction takes place as a result of fusion between two gamets, one from
each parent, it is called sexual reproduction.
– This process of fusion between two gamets is called fertilization.
– The formation of gamets involves exchange of chromosomal (genetic)
fragments between homologous chromosomes causing genetic
recombination which leads to variation.
SEXUAL REPRODUCTION IN PLANTS
It occurs mostly in flowering plants. In fact flowers are the reproductive organ of
plants.


A typical flower consists of four main whorls namely calyx (sepals), Corolla
(Petals), Androecium (Stamens) and Gynoecium (Carpels).



– Pollen grains of a flower transfer to stigma of the carpel of the same flower
(Self-Pollination) or to the carpel of the another flower (Cross-Pollination).
– This transfer of pollens is achieved by agent like wind, water or animals.
– After Pollination, the pollen grains reach to the egg cell in the form of a pollen
tube.

Fertilization : The fusion between the pollen grain and female egg cell. It
occurs inside the ovary. Zygote is produced in this process.


– Zygote divides several times to form an embryo within the ovule. The ovule
develops a tough coat and is converted into a seed.

– Ovary grows rapidly and ripens to forms a fruit, while the seed contains the
future plant or embryo which develops into a seedling under suitable
condition. This process is known as Germination.

REPRODUCTION IN HUMAN BEINGS
– Humans use a Sexual Mode of reproduction.
– It needs sexual maturation which includes creation of the germ cells ie, egg
(ova) in the female and sperm in the male partener & this period of sexual
maturation is called Puberty.
– Human beings have a well developed male and female reproductive system.
– The formation of male germ cell (sperms) takes place in the testes (male
reproducture organ)
– Actually a pair of testes are located inside scrotum situated outside the
abdominal cavity. It is meant to keep relatively a low temperature needed for
the production of sperms by testes.
– Moreover testes release a male sex hormone called testosterone whose
function is to:

1. Regulate the production of sperm
2. Brings about changes in appearance seen in boys at the time of puberty
The sperms along with the secretion of prostate gland and seminal vesicle,
together constitute semen, which is released and made to enter into the female
genital tract during Copulation.

The female germ cells or eggs are made in the ovaries, a pair of which is
located in both side of abdomen.

When a girl is born, the ovaries already contain thousands of immature
eggs.

At the puberty, some of these Eggs start maturing. One egg is produced every
month by one of the ovaries.
The Egg is carried from the ovary to the womb through a fallopian tube. These
two fallopian tube unite into an elastic bag like structure known as Uterus.

The Uterus opens into the vagina through the cervix.

Fertilization occurs in the fallopian tube of female genital tract.

The fertilized egg also called zygote (2n) gets implanted in the lining of the
Uterus, and start dividing. Actually uterus is richly supplied with blood to
nourish the growing embryo. If zygote is not formed, the inner wall of uterus
breaks which causes bleeding through vagina. This process is called
MENSTRUATION. It occurs at a regular interval of 28 days.

The Embroyo gets nutrition from the mother's blood with the help of a special
tissue called PLACENTA. It provides a large surface area for glucose and
oxygen to pass from the mother to the embryo. Similarly the wastes from
developing embryo are removed to mother's blood through placenta.

The child is born as a result of rhythmic contractions of the muscles in the
uterus. after Nine months (36 weeks) of development inside mother's womb.
It is also called Gestation Period.

The sexual cycle in a woman continues upto the age of 45 to 50 years. After
that the ovary do not release egg. This stage is called Menopause. It a also
marks the end of menstruation in the woman.



LIGHT-REFLECTION & REFRACTION CBSE Class X

Important Notes of LIGHT-REFLECTION & REFRACTION 

Light is a form of energy, which enable us to see the object.
In this chapter we will study the phenomena of reflection and refraction using the
property of light i.e. straight line propagation (Light wave travel from one point to
another, along a straight line).

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Download CLASS 10th CBSE Sample papers 2019

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