Q1.Which natural resources are called the
“
biodiversity hot spots
”? How these hot spots
maintain ecological balance
?
Q2.Explain with the help of labelled diagrams the development that takes place in each of the body parts of a Planaria where body is cut into three pieces. None this process and give an example of an organism in which a similar process can be observed.
Q3.List any four methods of contraception used b y humans. How does the use of three methods have a direct effect on the heath and prosperity of a family?
Q4.A. How does speciation take place?
B. Define the term GENE.
C. The gene for red hair is recessive to the gene for black hair. What will be the hair colour of a child if he inherits a gene for red colour from his mother and a gene for black hair from his father? Express with the help of flow chart
Q5.“Different species use different strategies to determine sex of a new born individual. It can be environmental cues or genetically determined”. Justify this statement giving reason/example
Q6.What are homologous organs? How do they provide evi dence in support of evolution?
Q7.Explain double fertilization in plants.
Q8.Name one organ analogous to the wing of the bird. W hy are they both analogous? Can you include the wing of bat also with them under the sa me category? Give reason.
Q9.Discuss in brief the various modes of reproduction used by single organisms.
Q10.DDT that was sprayed in minute amount on food plant s was detected in high concentration in man? How did it happen? Explain.
Q11.State three laws of Mendel.
Q12.Mention any four details that can be inferred about organisms from their fossils.
Q13.Energy transfer is said to be unidirectional where as biochemical transfer is said be cyclic. Why?
Q15.What are the advantages and disadvantages of self a nd cross pollination? Which of them is better and why?
Q16.How has the method of ‘artificial selection’ by hum ans helped in the evolution of different vegetables?
Q17.What is ten percent law? Explain with an example ho w energy flows through different trophic levels?
Q2.Explain with the help of labelled diagrams the development that takes place in each of the body parts of a Planaria where body is cut into three pieces. None this process and give an example of an organism in which a similar process can be observed.
Q3.List any four methods of contraception used b y humans. How does the use of three methods have a direct effect on the heath and prosperity of a family?
Q4.A. How does speciation take place?
B. Define the term GENE.
C. The gene for red hair is recessive to the gene for black hair. What will be the hair colour of a child if he inherits a gene for red colour from his mother and a gene for black hair from his father? Express with the help of flow chart
Q5.“Different species use different strategies to determine sex of a new born individual. It can be environmental cues or genetically determined”. Justify this statement giving reason/example
Q6.What are homologous organs? How do they provide evi dence in support of evolution?
Q7.Explain double fertilization in plants.
Q8.Name one organ analogous to the wing of the bird. W hy are they both analogous? Can you include the wing of bat also with them under the sa me category? Give reason.
Q9.Discuss in brief the various modes of reproduction used by single organisms.
Q10.DDT that was sprayed in minute amount on food plant s was detected in high concentration in man? How did it happen? Explain.
Q11.State three laws of Mendel.
Q12.Mention any four details that can be inferred about organisms from their fossils.
Q13.Energy transfer is said to be unidirectional where as biochemical transfer is said be cyclic. Why?
Q15.What are the advantages and disadvantages of self a nd cross pollination? Which of them is better and why?
Q16.How has the method of ‘artificial selection’ by hum ans helped in the evolution of different vegetables?
Q17.What is ten percent law? Explain with an example ho w energy flows through different trophic levels?
No comments:
Post a Comment