We have compiled the NCERT MCQ Questions for Class 8 Science Chapter 10 Reaching the Age of Adolescence with Answers Pdf free download covering the entire syllabus. Practice MCQ Questions for Class 8 Science with Answers on a daily basis and score well in exams. Refer to the Reaching the Age of Adolescence Class 8 MCQs Questions with Answers here along with a detailed explanation.
Reaching the Age of Adolescence Class 8 MCQs Questions with Answers
Choose the correct option.
Question 1.
The adolescence period is
(a) 14 – 20 years
(b) 10 – 18 years
(c) 11 – 19 years
(d) none of these
Answer
Answer: (c) 11 – 19 years
Question 2.
Larynx is called
(a) music box
(b) voice box
(c) respiratory organ
(d) sound box
Answer
Answer: (b) voice box
Question 3.
Most adolescents attain their maximum height around the age of
(a) 22 – 25 years
(b) 13 – 15 years
(c) 11 – 12 years
(d) 18 – 19 years
Answer
Answer: (d) 18 – 19 years
Question 4.
Initially girls grow
(a) slower than boys
(b) faster than boys
(c) both of these
(d) none of these
Answer
Answer: (b) faster than boys
Question 5.
Puberty age in females is
(a) 10 – 12 years
(b) 12 – 14 years
(c) 8 – 10 years
(d) 5 – 6 years
Answer
Answer: (a) 10 – 12 years
Question 6.
Puberty age in males is
(a) 12 – 14 years
(b) 13 – 15 years
(c) 10 – 12 years
(d) 18 – 20 years
Answer
Answer: (a) 12 – 14 years
Question 7.
Thyroxine hormone is produced by
(a) adrenal gland
(b) testes
(c) pituitary gland
(d) thyroid gland
Answer
Answer: (d) thyroid gland
Question 8.
The male hormone is called
(a) estrogen
(b) testosterone
(c) thyroxine
(d) insulin
Answer
Answer: (b) testosterone
Question 9.
The female hormone is called
(a) estrogen
(b) testosterone
(c) adrenaline
(d) none of these
Answer
Answer: (a) estrogen
Question 10.
Menstruation occurs once in about
(a) 28 to 30 days
(b) 25 to 30 days
(c) 45 to 50 days
(d) none of these
Answer
Answer: (a) 28 to 30 days
Question 11.
The number of chromosomes present in human cell are
(a) 25 pairs
(b) 22 pairs
(c) 23 pairs
(d) none of these
Answer
Answer: (c) 23 pairs
Question 12.
The number of sex chromosomes are
(a) three
(b) two
(c) four
(d) none of these
Answer
Answer: (b) two
Question 13.
The age of menopause stage is
(a) 45 to 50 years
(b) 40 to 45 years
(c) 50 to 55 years
(d) none of these
Answer
Answer: (a) 45 to 50 years
Question 14.
The unfertilised egg always has ______ chromosome.
(a) X
(b) Y
(c) XY
(d) XX
Answer
Answer: (a) X
Question 15.
A female has
(a) XY chromosomes
(b) YY chromosomes
(c) XX chromosomes
(d) none of these
Answer
Answer: (c) XX chromosomes
Question 16.
The gametes have only
(a) one set of chromosomes
(b) two sets of chromosomes
(c) three sets of chromosomes
(d) none of these
Answer
Answer: (a) one set of chromosomes
Question 17.
Which of the following is male gonads?
(a) Moustache
(b) Chest
(c) Testes
(d) Hair
Answer
Answer: (c) Testes
Question 18.
Production of thyroxine requires
(a) magnesium
(b) iodine
(c) sodium
(d) bromine
Answer
Answer: (b) iodine
Question 19.
Which of the following determines the sex of the baby?
(a) Chromosomes
(b) Chloroplast
(c) Hormones
(d) Pituitary gland
Answer
Answer: (a) Chromosomes
Question 20.
Pancreas is responsible for maintaining
(a) blood pressure
(b) fat metabolism
(c) blood glucose level
(d) electrolyte balance
Answer
Answer: (c) blood glucose level
Question 21.
Adolescence usually ends at which age?
(a) 18 years
(b) 17 years
(c) 16 years
(d) 15 years
Answer
Answer: (a) 18 years
Question 22.
Which hormone is responsible for the secondary sexual characters in girls?
(a) Estrogen
(b) Testosterone
(c) Thyroxine
(d) Adrenaline
Answer
Answer: (a) Estrogen
Question 23.
What is the normal duration of menstrual cycle?
(a) 2 to 7 days
(b) 14 days
(c) 28 to 30 days
(d) 40 weeks
Answer
Answer: (c) 28 to 30 days
Question 24.
Reproductive phase in women continues for how many decades?
(a) One
(b) Two
(c) Three
(d) Four
Answer
Answer: (d) Four
Question 25.
Which hormone is secreted by pancreas?
(a) Thyroxine
(b) Insulin
(c) Adrenaline
(d) Testosterone
Answer
Answer: (b) Insulin
Question 26.
Iodine is essential for proper working of which of the following endocrine glands?
(a) Thyroid
(b) Pituitary
(c) Adrenal
(d) Pancreas
Answer
Answer: (a) Thyroid
Question 27.
Which of the following glands secretes the growth hormone?
(a) Thyroid
(b) Pituitary
(c) Adrenal
(d) Testis
Answer
Answer: (b) Pituitary
Question 28.
Which of the following glands secretes oil?
(a) Thyroid gland
(b) Pituitary gland
(c) Sebaceous gland
(d) Endocrine gland
Answer
Answer: (c) Sebaceous gland
Question 29.
Which of the following is the male hormone that is secreted by the testes at the onset of puberty?
(a) Estrogen
(b) Insulin
(c) Adrenalin
(d) Testosterone
Answer
Answer: (d) Testosterone
Question 30.
The female hormone secreted by the ovaries at the onset of puberty is
(a) estrogen
(b) insulin
(c) adrenalin
(d) testosterone
Answer
Answer: (a) estrogen
Fill in the Blanks
Question 1.
________ means to grow into maturity.
Answer
Answer: Adolescence
Question 2.
Children gain height during _________ .
Answer
Answer: puberty
Question 3.
The boys and girls passing through the adolescence period are called __________ or __________ .
Answer
Answer: adolescents, teenagers
Question 4.
During puberty, a change in voice takes place due to the increase in the size of __________ or __________
Answer
Answer: voice box, larynx
Question 5.
The stage when the menstrual cycle stops is called __________ .
Answer
Answer: menopause
Question 6.
The __________ gland helps in controlling the production of both testosterone and estrogen hormones.
Answer
Answer: pituitary
Question 7.
Diabetes is caused due to the deficiency of__________ in the body.
Answer
Answer: insulin
Question 8.
_________ is caused due to deficiency of thyroxine hormone.
Answer
Answer: Goitre
Question 9.
Endocrine glands are also called _________ glands.
Answer
Answer: ductless
Question 10.
__________ secrets male sex hormones.
Answer
Answer: Testes
Question 11.
_________ secrets female sex hormones.
Answer
Answer: Ovary
Question 12.
Sex of the unborn child depends on whether the _________ has _________ or _________ chromosomes.
Answer
Answer: zygote, XX, XY
Question 13.
Metamorphosis in insects is controlled by _________hormone.
Answer
Answer: insect
Question 14.
Metamorphosis in frog is controlled by _________hormone.
Answer
Answer: thyroxine
Question 15.
If the water in which tadpoles are growing does not contain sufficient _________, the tadpoles cannot become adults.
Answer
Answer: iodine
Question 16.
In females, the uterine wall thickens to receive the _________
Answer
Answer: zygote
Question 17.
Endocrine glands release hormones directly into the _________for transportation to the _________
Answer
Answer: blood stream, target site
Question 18.
_________helps the body to adjust and fight the stress.
Answer
Answer: Adrenaline
Question 19.
The development of a caterpillar to an adult butterfly is termed as _________
Answer
Answer: metamorphosis
Question 20.
The first menstrual flow begins at and is termed as _________
Answer
Answer: puberty, menarche
Question 21.
Children gain height during …………………….
Answer
Answer: adolescence
Question 22.
Hormones are secretions of ……………………. glands.
Answer
Answer: endocrine
Question 23.
The onset of puberty and maturation of reproductive parts are controlled by …………………….
Answer
Answer: hormones
Question 24.
It is important to eat ……………………. diet and maintain personal hygiene during adolescence.
Answer
Answer: balanced
Question 25.
At puberty the ……………………. start releasing the mature eggs.
Answer
Answer: ovaries
Question 26.
Pancreas secretes ……………………., thyroid produces ……………………. and adrenals produce ……………………. hormone.
Answer
Answer: insulin, thyroxine, adrenalin
True or False
Question 1.
The age of adolescence is 15 to 20 years.
Answer
Answer: False
Question 2.
The female puberty starts at the age of 12 to 14 years.
Answer
Answer: False
Question 3.
Boys have enlarged and well developed Adam’s apple.
Answer
Answer: True
Question 4.
Insulin is secreted by pituitary gland.
Answer
Answer: False
Question 5.
The chemical substances secreted by endocrine glands are called hormones.
Answer
Answer: True
Question 6.
Estrogen is female hormone.
Answer
Answer: True
Question 7.
Testosterone is male hormone.
Answer
Answer: True
Question 8.
There are 23 pairs of chromosomes in the nuclei of human cell.
Answer
Answer: True
Question 9.
Menstruation stops in men permanently around the age of 45 to 50 years.
Answer
Answer: False
Question 10.
The estrogen hormone develops deeper voice in males at puberty.
Answer
Answer: False
Question 11.
The sex of an unborn child is determined after a foetus is formed.
Answer
Answer: False
Question 12.
Initially girls grow faster than boys.
Answer
Answer: True
Question 13.
Thyroxine hormone is released by thyroid gland.
Answer
Answer: True
Question 14.
Diabetes is caused due to the deficiency of adrenaline hormone.
Answer
Answer: False
Question 15.
Menstrual cycle in women is controlled by enzyme.
Answer
Answer: False
Question 16.
Growth hormones are secreted by pituitary glands.
Answer
Answer: True
Question 17.
Metamorphosis in insects are controlled by growth hormone.
Answer
Answer: False
Question 18.
Menstruation occurs once in about 28 to 30 days.
Answer
Answer: True
Question 19.
There are 3 sex chromosomes present in the nuclei of human being.
Answer
Answer: False
Question 20.
A male has two X chromosomes.
Answer
Answer: False
Question 21.
The gametes have only one set of chromosomes.
Answer
Answer: True
Question 22.
The unfertilised egg has two X chromosomes.
Answer
Answer: False
Question 23.
At puberty, the voice box or the larynx begins to grow.
Answer
Answer: True
Question 24.
When the zygote has one X and one Y chromosome, a male child is developed.
Answer
Answer: True
Question 25.
Menopause is the stage when menstruation starts.
Answer
Answer: False
Question 26.
A total of 23 pairs of chromosomes are found in the nuclei of human cells.
Answer
Answer: True
Question 27.
Testes are responsible for the production of sperms.
Answer
Answer: True
Question 28.
Stoppage of menstruation is called adolescence.
Answer
Answer: False
Question 29.
The sex of an unborn child is determined only after a foetus is formed.
Answer
Answer: False
Question 30.
The estrogen hormone develops deeper voice in males at puberty.
Answer
Answer: False
Question 31.
Adam’s apple is a feature of both males and females.
Answer
Answer: False
Question 32.
Some sperms have X type and some have Y type chromosome.
Answer
Answer: True
Match the following
| Column I | Column II |
| 1. Growth hormones | (a) Voice box |
| 2. Pituitary gland | (b) Thyroxine |
| 3. XX chromosomes | (c) Male child |
| 4. Adrenal gland | (d) Male hormone |
| 5. Thyroid gland | (e) Adrenaline |
| 6. XY chromosomes | (f) Female child |
| 7. Pancreas | (g) Stoppage of menstruation |
| 8. Testosterone | (h) Insulin |
| 9. Menopause | (i) Master gland |
| 10. Adam’s apple | (j) Pituitary gland |
Answer
Answer:
| Column I | Column II |
| 1. Growth hormones | (j) Pituitary gland |
| 2. Pituitary gland | (i) Master gland |
| 3. XX chromosomes | (f) Female child |
| 4. Adrenal gland | (e) Adrenaline |
| 5. Thyroid gland | (b) Thyroxine |
| 6. XY chromosomes | (c) Male child |
| 7. Pancreas | (h) Insulin |
| 8. Testosterone | (d) Male hormone |
| 9. Menopause | (g) Stoppage of menstruation |
| 10. Adam’s apple | (a) Voice box |
| Column A | Column B |
| 1. Pituitary gland | (a) Thyroxine |
| 2. Thyroid | (b) Adrenalin |
| 3. Adrenals | (c) Insulin |
| 4. Pancreas | (d) Growth hormone |
| 5. XX chromosomes | (e) Boy |
| 6. XY chromosomes | (f) Girl |
Answer
Answer:
| Column A | Column B |
| 1. Pituitary gland | (d) Growth hormone |
| 2. Thyroid | (a) Thyroxine |
| 3. Adrenals | (b) Adrenalin |
| 4. Pancreas | (c) Insulin |
| 5. XX chromosomes | (f) Girl |
| 6. XY chromosomes | (e) Boy |
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