NCERT Solutions for Class 8 Science Chapter 7 Reaching the Age of Adolescence
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Page 1
NCERT
SOLUTIONS
CLASS - 8TH
aglase .co
SOLUTIONS
CLASS - 8TH
aglase .co
Page 2
Book : Science Ncert Solutions | Chapter-10 Science
Class : 8th
Subject : Science
Chapter : 10
Chapter Name : REACHING THE AGE OF ADOLESCENCE
Q1 What is the term used for chemical 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.
Q2 De�ne 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.
Q3 What is menstruation? Explain.
Answer. Menstruation is the process of the shedding of the uterine lining on a regular monthly basis. It
begins at puberty and is the reproductive cycle of the female body. Every month, the uterus prepares
itself to receive a fertilized egg. Therefore, the inner lining of the uterus becomes thick and is supplied
with blood to nourish the embryo. If the egg is not fertilized, then the lining of the uterus breaks down
and gets released in the form of blood through the vagina. This lasts for about two to eight days. This
cycle occurs every month and is known as the menstrual cycle.
Q5 List changes in the body that take place at puberty.
Answer. Changes at puberty:
(i) Sudden increase in height and weight.
(ii) Broadening of shoulders and widening of chest in boys, In girls, the region below waist becomes
wider.
(iii) In boys, under the in�uence of hormones, the larynx becomes prominent, the vocal cords become
longer and thicker. These changes cause the voice to become hoarse.
(iv) Appearance of hair in areas such as underarms, face, hands, and legs.
(v) Appearance of acne as a result of excessive secretion of oil from skin.
(iv) Testis grows and starts producing sperms in males, whereas in females, the ovary enlarges and
starts producing matured eggs.
Page 1 of 6 Aglasem Schools
Class : 8th
Subject : Science
Chapter : 10
Chapter Name : REACHING THE AGE OF ADOLESCENCE
Q1 What is the term used for chemical 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.
Q2 De�ne 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.
Q3 What is menstruation? Explain.
Answer. Menstruation is the process of the shedding of the uterine lining on a regular monthly basis. It
begins at puberty and is the reproductive cycle of the female body. Every month, the uterus prepares
itself to receive a fertilized egg. Therefore, the inner lining of the uterus becomes thick and is supplied
with blood to nourish the embryo. If the egg is not fertilized, then the lining of the uterus breaks down
and gets released in the form of blood through the vagina. This lasts for about two to eight days. This
cycle occurs every month and is known as the menstrual cycle.
Q5 List changes in the body that take place at puberty.
Answer. Changes at puberty:
(i) Sudden increase in height and weight.
(ii) Broadening of shoulders and widening of chest in boys, In girls, the region below waist becomes
wider.
(iii) In boys, under the in�uence of hormones, the larynx becomes prominent, the vocal cords become
longer and thicker. These changes cause the voice to become hoarse.
(iv) Appearance of hair in areas such as underarms, face, hands, and legs.
(v) Appearance of acne as a result of excessive secretion of oil from skin.
(iv) Testis grows and starts producing sperms in males, whereas in females, the ovary enlarges and
starts producing matured eggs.
Page 1 of 6 Aglasem Schools
Page 3
Book : Science Ncert Solutions | Chapter-10 Science
Q5 Prepare a Table having two columns depicting names of endocrine glands and hormones secreted by
them
Answer.
Q6 What are sex hormones? Why are they named so? State their function.
Answer. Sex hormones are chemical substances produced by sex organs. For example, testosterone is
the male sex hormone produced by the testis, and oestrogen is the female sex hormone produced by the
ovary. These hormones affect the sexual features of an organism. Hence, they are known as sex
hormones.
Functions of sex hormones:
Testosterone: This hormone brings about secondary sex characters in boys such as the growth of a
beard, the voice becoming hoarse, development of reproductive organs, etc.
Oestrogen: This hormone is responsible for the development of secondary sexual characters in females
such as the enlargement of breasts, development of female reproductive organs, etc.
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) chapati, dal, vegetables.
(iii) rice, noodles and burger.
(iv) vegetable cutlets, chips and lemon drink.
Page 2 of 6 Aglasem Schools
Q5 Prepare a Table having two columns depicting names of endocrine glands and hormones secreted by
them
Answer.
Q6 What are sex hormones? Why are they named so? State their function.
Answer. Sex hormones are chemical substances produced by sex organs. For example, testosterone is
the male sex hormone produced by the testis, and oestrogen is the female sex hormone produced by the
ovary. These hormones affect the sexual features of an organism. Hence, they are known as sex
hormones.
Functions of sex hormones:
Testosterone: This hormone brings about secondary sex characters in boys such as the growth of a
beard, the voice becoming hoarse, development of reproductive organs, etc.
Oestrogen: This hormone is responsible for the development of secondary sexual characters in females
such as the enlargement of breasts, development of female reproductive organs, etc.
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) chapati, dal, vegetables.
(iii) rice, noodles and burger.
(iv) vegetable cutlets, chips and lemon drink.
Page 2 of 6 Aglasem Schools
Page 4
Book : Science Ncert Solutions | Chapter-10 Science
Answer. (a) (ii) Adolescents should be careful about what they eat, because proper diet is needed for
therapid growth taking place in their body.
(b) (i) Reproductive age in women starts when their menstruation starts.
(c) (ii) The right meal for adolescents consists of chapatti, dal, vegetables.
Q8 Write notes on—
(a) Adam’s apple.
(b) Secondary sexual characters.
(c) Sex determination in the unborn baby
Answer. (a) Adam's apple:
In human males, the larynx grows larger during puberty and can be seen as a protruding part ofthe
throat. This protrusion is known as the Adam's apple. In boys, under the in�uence of sexhormones, the
larynx becomes prominent. As a result, the vocal cords become longer and thicker,causing the voice to
become hoarse.
However, in females, the larynx is of a small size and is hardly visible. Therefore, girls have a high
pitched voice, while the voice of boys is low pitched.
(b) Secondary sexual characters are those features that help in distinguishing the male and the female
body from each other. They are physical or behavioural characteristics that appear inhumans at the
time of puberty.
Secondary sexual characters in boys:
(i) Appearance of moustache and beard.
(ii) Appearance of chest hair.
(iii) Growth of hair in genital area and other parts of the skin.
Secondary sexual character in girls:
(i) Increase in breast size and darkening of the skin of nipples present at the tip of the breasts.
(ii) Growth of hair in genital area and other body parts.
(c) Sex determination in an unborn baby:
.
The sex of a baby is determined by the type of male gamete that fuses with the female gamete.All
human beings have 23 pairs of chromosomes in their nuclei. Out of these 23 pairs, the last pairis known
as the sex chromosome.
The human males have 23 pairs of chromosomes including XY sex chromosomes.
Therefore, the male gamete has 22 chromosomes and either an X or Y sex chromosome.Male gametes
can be of two types: 22+X or 22+Y
Females have 23 pairs of chromosomes including XX sex chromosomes. Therefore, their gametes can
only have 22 chromosomes and one X sex chromosome.
Type of female gametes: 22+X
Page 3 of 6 Aglasem Schools
Answer. (a) (ii) Adolescents should be careful about what they eat, because proper diet is needed for
therapid growth taking place in their body.
(b) (i) Reproductive age in women starts when their menstruation starts.
(c) (ii) The right meal for adolescents consists of chapatti, dal, vegetables.
Q8 Write notes on—
(a) Adam’s apple.
(b) Secondary sexual characters.
(c) Sex determination in the unborn baby
Answer. (a) Adam's apple:
In human males, the larynx grows larger during puberty and can be seen as a protruding part ofthe
throat. This protrusion is known as the Adam's apple. In boys, under the in�uence of sexhormones, the
larynx becomes prominent. As a result, the vocal cords become longer and thicker,causing the voice to
become hoarse.
However, in females, the larynx is of a small size and is hardly visible. Therefore, girls have a high
pitched voice, while the voice of boys is low pitched.
(b) Secondary sexual characters are those features that help in distinguishing the male and the female
body from each other. They are physical or behavioural characteristics that appear inhumans at the
time of puberty.
Secondary sexual characters in boys:
(i) Appearance of moustache and beard.
(ii) Appearance of chest hair.
(iii) Growth of hair in genital area and other parts of the skin.
Secondary sexual character in girls:
(i) Increase in breast size and darkening of the skin of nipples present at the tip of the breasts.
(ii) Growth of hair in genital area and other body parts.
(c) Sex determination in an unborn baby:
.
The sex of a baby is determined by the type of male gamete that fuses with the female gamete.All
human beings have 23 pairs of chromosomes in their nuclei. Out of these 23 pairs, the last pairis known
as the sex chromosome.
The human males have 23 pairs of chromosomes including XY sex chromosomes.
Therefore, the male gamete has 22 chromosomes and either an X or Y sex chromosome.Male gametes
can be of two types: 22+X or 22+Y
Females have 23 pairs of chromosomes including XX sex chromosomes. Therefore, their gametes can
only have 22 chromosomes and one X sex chromosome.
Type of female gametes: 22+X
Page 3 of 6 Aglasem Schools
Page 5
Book : Science Ncert Solutions | Chapter-10 Science
Thus, as the mother provides only X chromosome, the sex of the baby is determined by the typeof male
gamete (X or Y) that fuses with the X chromosome of the female.
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 thyroxine
3. Another term for teenage
5. Hormone reaches here through blood stream
6. Voice box
7. Term for changes at adolescence
Page 4 of 6 Aglasem Schools
Thus, as the mother provides only X chromosome, the sex of the baby is determined by the typeof male
gamete (X or Y) that fuses with the X chromosome of the female.
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 thyroxine
3. Another term for teenage
5. Hormone reaches here through blood stream
6. Voice box
7. Term for changes at adolescence
Page 4 of 6 Aglasem Schools
Page 6
Book : Science Ncert Solutions | Chapter-10 Science
Answer. Across
3. ADAM'S APPLE
4. ENDOCRINE
7. PITUITARY
8. HORMONE
g. INSULIN
10. ESTROGEN
Down
1. TESTOSTERONE
2. THYROID
3. ADOLESCENCE
5. TARGET SITE
6. LARYNX
7. PUBERTY
Page 5 of 6 Aglasem Schools
Answer. Across
3. ADAM'S APPLE
4. ENDOCRINE
7. PITUITARY
8. HORMONE
g. INSULIN
10. ESTROGEN
Down
1. TESTOSTERONE
2. THYROID
3. ADOLESCENCE
5. TARGET SITE
6. LARYNX
7. PUBERTY
Page 5 of 6 Aglasem Schools
Page 7
Book : Science Ncert Solutions | Chapter-10 Science
Page 6 of 6 Aglasem Schools
Page 6 of 6 Aglasem Schools
Document Details
| Board / Org | NCERT |
| Exam | Class 8 |
| Type | Solution |
| Pages | 7 |
| Language | english |
| Updated | 30 Apr 2026 |