Control And coordination Class 10 Very important Questions

1.Mention one function for each of these hormones.
i) Thyroxine
ii) Insulin
iii) Adrenaline
iv) Growth hormone
v) Testosterone.

Ans.(i) Thyroxin – Control overall metabolic rate of the body (carbohydrate, protein and fat metabolism
(ii) Insulin – Conversion of glucose to glycogen in liver and muscles, thus decreases blood glucose level.
(iii) Adrenalin – increases heart beat, blood pressure and blood glucose level.
(iv) Growth hormone – Body growth and development of bones.
(v) Testosterone – Development of male sex organ sand secondary sex characteristics like moustache, beard & voice

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Class 10 Important Questions and Answers

Science

Chemical Reactions and Equations

The Rise of Nationalism In Europe Class 10 important Questions

CBSE CLASS-X Social Science
 Important Questions History Chapter-1 The Rise of Nationalism In Europe

1. How did the Journalist Wilhelm Wolff describe the revolt led by the Silesia weavers against contractors in 1845?
Ans. In 1845, weavers of Silesia had led a revolt against contractors who supplied them raw materials. They gave them order for finished textiles but drastically reduced their payments.
1. The workers were living in extreme poverty and misery.
2. The desperate need for has been taken advantage of by the contractors to reduce the prices of the goods they order.
3. On 4 June at 2 P.M. a large crowd of weavers emerged from their homes and marched in pairs up to the mansion of their contractor demanding higher wages.
4. They were treated with scorn and threats alternately.
5. A group of weavers entered in to a house of a contractor. They smashed the window
panes, furniture and porcelain. They entered the storehouse and tore to shreds the supplies of cloth.
6. The contractor fled away with his family to a neighboring village and came back after 24 hours with army.

How do Organisms Reproduce? Class 10 Science Important Questions

1. What changes occur in girls and boys in the age group of 10 -14 years?
Ans.
Changes in males (boys)
1) Widening of shoulder.
2) Deepening of voice
3) Appearance of beard and moustaches
4) Growth of sex organs
Changes in females (girls)
1) Widening of pelvis and hips.
2) High pitch voice.
3) Growth of auxiliary and pubic hair
4) Initiation of menstrual cycle.
5) Growth of mammary glands.

Heredity and Evolution Class 10 Important Questions

1. Only variations that confer an advantage to an individual 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 survive in a population while a variation in an animal like a leopard may survive.

Control And Coordination Class 10 Important Questions

1. Mention three important functions of gibberellins.
Ans. Functions of Gibberllins –
(i) Stimulate stem elongation.
(ii) Help in breaking seed dormancy.
(iii) Promote flowering in some plants even under unfavorable conditions
(iv) Help in seed germination.
(v) Promote production of male flowers

Life Processes Class 10 Science Important Questions

1. What are the functions of lymph in our body?
Ans. Functions of lymph are-
a) It returns tissue fluid from interstitial space into the blood.
b) It collects carbon dioxide, waste products and metabolites from tissues via tissue fluid.
c) Lymph has lymphocytes (WBC’S), the lymph provides in immunity to the body and fight against the invading organisms.