Solution of Chapter 10. Reaching The Age of Adolescence (NCERT - Science Book)

What is the term used for secretions of endocrine glands responsible for changes taking place in the body?

Define adolescence.

What is menstruation? Explain.

List changes in the body that take place at puberty.

Prepare a table having two columns depicting names of endocrine glands and hormones secreted by them.

What are sex hormones? Why are they named so? State their function.

Choose the correct option.

(a) Adolescents should be careful about what they eat, because

(i) proper diet develops their brains.

(ii) proper diet is needed for the rapid growth taking place in their body.

(iii) adolescents feel hungry all the time.

(iv) taste buds are well developed in teenagers.

Choose the correct option.

Reproductive age in women starts when their

(i) menstruation starts.

(ii) breasts start developing.

(iii) body weight increases.

(iv) height increases.

Choose the correct option.

The right meal for adolescents consists of

(i) chips, noodles, coke.

(ii) chapatti, dal, vegetables.

(iii) rice, noodles and burger.

(iv) vegetable cutlets, chips and lemon drink.

Write notes on –

(a) Adam's apple:

(b) Secondary sexual characters: T

(c) Sex determination in an unborn baby:

Word game: Use the clues to work out the words.

Across

3. Protruding voice box in boys

4. Glands without ducts

7. Endocrine gland attached to brain

8. Secretion of endocrine glands

9. Pancreatic hormone

10. Female hormone

Down

1. Male hormone

2. Secretes thyroxin

3. Another term for teenage

5. Hormone reaches here through blood stream

6. Voice box

7. Term for changes at adolescence

The table below shows the data on likely heights of boys and girls as they grow in age. Draw graphs showing height and age for both boys and girls on the same graph paper. What conclusions can be drawn from these graphs?