NCERT Solutions for Class 8 Science Science - NCERT Solution Chapter 10

Reaching the Age of Adolescence Class 8

Chapter 10 Reaching the Age of Adolescence Exercise Solutions

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Exercise : Solutions of Questions on Page Number : 124

Q1 :  

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


Answer :

Hormones are chemical substances which are secreted by endocrine glands. They are responsible for changes taking place in the body.

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Q2 :  

Define adolescence.


Answer :

Adolescence is the time period between the beginning of puberty and adulthood. During this period, the body undergoes several changes alongside reproductive maturity. It begins around the age of 11 and lasts till 18 or 19 years of age. The period of adolescence may vary from person to person.

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Q3 :  

What is menstruation? Explain.


Answer :

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Q4 :  

List changes in the body that take place at puberty.


Answer :

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Q5 :  

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


Answer :

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Q6 :  

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


Answer :

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Q7 :  

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.

(b) Reproductive age in women starts when their

(i) menstruation starts.

(ii) breasts start developing.

(iii) body weight increases.

(iv) height increases.

(c) 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.


Answer :

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Q8 :  

Write notes on -

(a) Adam's apple.

(b) Secondary sexual characters.

(c) Sex determination in the unborn baby.


Answer :

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Q9 :  

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


Answer :

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Q10 :  

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


Answer :

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Science - NCERT Solution - Science : CBSE NCERT Exercise Solutions for Class 8th for Reaching the Age of Adolescence will be available online in PDF book form soon. The solutions are absolutely Free. Soon you will be able to download the solutions.

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