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NCERT solutions Science Textbook For Class 8 chapter 10 Reaching the Age of Adolescence

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Chapter 10 - Reaching the Age of Adolescence

Pages 124 - 126

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

Q 1 | Page 124 | view solution

Define adolescence.

Q 2 | Page 124 | view solution

What is menstruation? Explain.

Q 3 | Page 124 | view solution

List changes in the body that take place at puberty.

Q 4 | Page 124 | view solution

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

Q 5 | Page 124 | view solution

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

Q 6 | Page 124 | view solution

Choose the correct option.

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.

Q 7.1 | Page 124 | view solution

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.

Q 7.2 | Page 124 | view solution

Choose the correct option.

The right meal for adolescents consists of

(i) chips, noodles, coke.

(ii) chapati, dal, vegetables.

(iii) rice, noodles and burger.

(iv) vegetable cutlets, chips and lemon drink.

Q 7.3 | Page 124 | view solution

Write notes on Adam’s apple

Q 8.1 | Page 124 | view solution

Write notes on Secondary sexual characters.

Q 8.2 | Page 124 | view solution

Write notes on Sex determination in the unborn baby.

Q 8.3 | Page 124 | view solution

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

Q 9 | Page 125 | view solution

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?

Age (Years)

Height (cm)

Boys Girls

0

53

53

4

96

92

8

114

110

12

129

133

16

150

150

20

173

165

Q 10 | Page 126 | view solution

Where to buy

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120
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