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8th Standard CBSE Science Unit 10 Reaching the Age of Adolescence Model Question Paper | QB365

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8th Standard CBSE Science Unit 10 Reaching the Age of Adolescence Model Question Paper

Published on: 14/08/2019

Reaching the Age of Adolescence

Download CBSE Class 8th Standard CBSE Science question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 8th Standard CBSE Science

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Std: 8th Standard CBSE - Science

chapter: - Model Question paper

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Questions:

Generic 3

5 x 3 = 15

Why is pituitary gland called 'Master Gland'?

Humans attain sexual maturity during puberty. How does this happen? Explain

Fill the blank circles in figure and identify the sex of child A and B.

List changes in the body that take place at puberty.

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

Multiple Choice Question

5 x 1 = 5

Sex chromosomes in a female body are

(a)

(b)

(c)

(d)

Protruding part of the throat in a boy is called

(a)

Voice box

(b)

Larynx

(c)

Adam's Apple

(d)

All of these

For the metamorphosis of tadpoles which of the following elements must be available in water?

(a)

Chlorine

(b)

Carbon

(c)

Sulphur

(d)

Iodine

The release of an egg from an ovary is called

(a)

fertilisation

(b)

menopause

(c)

menstruation

(d)

ovulation

10.

Adolescents should be careful about what they eat, because

(a)

proper diet develops their brains.

(b)

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

(c)

adolescents feel hungry all the time.

(d)

taste buds are well developed in teenagers.

Generic 5

2 x 5 = 10

11.

In figure, mark the position of the endocrine glands which release the hormones that
(a) control the release of sex hormones.
(b) are responsible for the secondary sexual characters in boys.
(c) prevent diabetes.
(d) maintain the correct salt balance in the blood.

12.

Observe the chart and graph given in figure carefully and answer the following questions.

Age in years	% of full height
Age in years	Boy	Girl
8	72%	77%
9	75%	81%
10	78%	84%
11	81%	88%
12	84%	91%
13	88%	95%
14	92%	98%
15	95%	99%
16	98%	99.5%
17	99%	100%
18	100%	100%

(a) Which of the line represents the height of boys?
(b) Which line represents the height of girls?
(c) What is the difference between the pattern of increase in the height of boys and girls?
(d) Is this pattern true for each individual?

Fill up / 1 Marks

3 x 1 = 3

13.

_____is male hormone and_______ is the female hormone.

14.

After attaining puberty, boyc develop a _____________ voice.

15.

Metamorphosis in amphibians such as frog is brought about by ______________ hormone

True or False

5 x 1 = 5

16.

The first menstruation flow is termed as menopause

(a)

True

(b)

False

17.

Adolescence is a stage of slow growth and development

(a)

True

(b)

False

18.

The menstrual flow lasts for 28-30 days.

(a)

True

(b)

False

19.

Half the female gametes contain X-chromosomes and the other half contain Y -chromosomes.

(a)

True

(b)

False

20.

Testes are responsible for production of sperms.

(a)

False

(b)

True

Match the following

5 x 1 = 5

21.

Sex chromosomes

22.

Estrogen

23.

Adrenaline

24.

Adrenal hormone

25.

Thyroxine

1 Marks

5 x 1 = 5

26.

What happens if there is no iodine present in water?

27.

Name the hormone which controls metamorphosis in frog

28.

Why should we say 'No' to Drugs?

29.

What is puberty?

30.

Unscramble the underlined words in the following sentences
Reproductive life of a woman lasts from hacreemn to spauoemen.

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Answers Key:

Generic 3

5 x 3 = 15

It is called so as it is the most important endocrine gland. Its size is just equal to a small pea. The hormones secreted by pituitary gland stimulate testes and ovaries to secrete their hormones. It also regulates the activity of other endocrine glands.

At puberty, the male and female sex organs get fully developed. The testes start secreting testosterone and start producing sperms. Similarly, in females, ovaries get enlarged and secrete oestrogen so as to produce matured eggs. Due to these sex hormones, humans attain sexual maturity.

At puberty, the body undergoes the following changes:
(i) Boys and girls become capable of reproduction.
(ii) Sudden increase in height.
(iii) Broad shoulders and wide chests in boys and region below the waist becomes wider in girls.
(iv) Growth of hairs on different parts of the body.
(v) Voice of girls becomes high pitched and that of boys becomes deep
(vi) Secretions of sweat and sebaceous glands increase.
(vii) Sex organs become active. In boys, testes start to form sperms and in girls, ovaries start to produce egg.
(viii) Changes at the mental, intellectual, and emotional levels.

Hormone is the term used for secretions of endocrine glands responsible for changes taking place in the body.

Multiple Choice Question

5 x 1 = 5

(d)
Iodine

(d)
ovulation

10.

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

Generic 5

2 x 5 = 10

11.

(a) Pituitary gland It releases hormones that control the release of sex hormones, i.e. testosterone in males and oestrogen in females.
(b) Testis It releases testosterone which is responsible for the secondary sexual character in boys.
(c) Pancreas It releases insulin which prevents diabetes.
(d) Adrenal gland It releases aldosterone that maintains the correct salt balance in the blood

12.

(a) The dotted line represents the height of boys.
(b) The solid line represents the height of girls.
(c) At the on-set of puberty, girls grow faster in height than the boys and by the age of 18 years, approximately both reach their maximum height.
(d) No, the rate of growth in height varies among individuals. Some may grow in height suddenly at puberty and then slow down, while others may grow gradually.

Fill up / 1 Marks

3 x 1 = 3

13.