🧑‍🤝‍🧑 Reaching the Age of Adolescence – MCQs for Class 8 Science

Part 1: Q1–Q25

Q1. The period of life when the body undergoes changes leading to reproductive maturity is called:

A) Puberty
B) Adolescence
C) Fertilization
D) Ovulation

✅ Correct Answer: A) Puberty

Explanation:

• A) ✔ Puberty is when physical & hormonal changes begin.
• B) Adolescence – Phase between childhood & adulthood, includes puberty.
• C, D – Biological processes, not the growth period.

Q2. Adolescence usually begins at the age of:

A) 2–3 years
B) 5–6 years
C) 11–12 years
D) 20–21 years

✅ Correct Answer: C) 11–12 years

Explanation:

• A, B – Too early.
• C) ✔ Puberty/adolescence usually starts at 11–12 years.
• D – By 20 years, adulthood begins.

Q3. Adolescence usually ends around the age of:

A) 12 years
B) 16–18 years
C) 8 years
D) 5 years

✅ Correct Answer: B) 16–18 years

Explanation:

• A, C, D – Incorrect ranges.
• B) ✔ Adolescence generally ends by 16–18 years when reproductive maturity is attained.

Q4. Which hormone is responsible for changes in boys during puberty?

A) Estrogen
B) Testosterone
C) Insulin
D) Progesterone

✅ Correct Answer: B) Testosterone

Explanation:

• A, D – Female hormones.
• B) ✔ Testosterone causes male characteristics like beard, voice change.
• C) Insulin – Controls sugar, unrelated to puberty.

Q5. Which hormone is responsible for changes in girls during puberty?

A) Estrogen
B) Testosterone
C) Insulin
D) Adrenaline

✅ Correct Answer: A) Estrogen

Explanation:

• A) ✔ Estrogen controls female characteristics (breasts, menstruation).
• B, C, D – Not related to female puberty changes.

Q6. The chemical substances secreted by endocrine glands are called:

A) Enzymes
B) Hormones
C) Vitamins
D) Acids

✅ Correct Answer: B) Hormones

Explanation:

• A) Enzymes – Help in reactions.
• B) ✔ Hormones regulate body functions.
• C, D – Not secreted by glands.

Q7. Which gland is called the “master gland”?

A) Thyroid
B) Pituitary
C) Pancreas
D) Adrenal

✅ Correct Answer: B) Pituitary

Explanation:

• A, C, D – Important glands but not master.
• B) ✔ Pituitary controls secretion of many other endocrine glands.

Q8. The thyroid gland produces which hormone?

A) Insulin
B) Adrenaline
C) Thyroxine
D) Testosterone

✅ Correct Answer: C) Thyroxine

Explanation:

• A, B, D – Produced by other glands.
• C) ✔ Thyroxine controls metabolism.

Q9. Lack of iodine in diet leads to:

A) Diabetes
B) Goitre
C) Obesity
D) Anaemia

✅ Correct Answer: B) Goitre

Explanation:

• A, C, D – Caused by other deficiencies.
• B) ✔ Iodine deficiency → enlarged thyroid (goitre).

Q10. Insulin is secreted by which gland?

A) Thyroid
B) Pituitary
C) Pancreas
D) Adrenal

✅ Correct Answer: C) Pancreas

Explanation:

• A, B, D – Produce other hormones.
• C) ✔ Pancreas produces insulin, regulates blood sugar.

Q11. Adrenal glands are located:

A) Near the kidneys
B) In the brain
C) In the throat
D) Near the heart

✅ Correct Answer: A) Near the kidneys

Explanation:

• A) ✔ Adrenal glands sit on top of kidneys.
• B, C, D – Incorrect positions.

Q12. Which hormone is released during fear or stress?

A) Insulin
B) Adrenaline
C) Thyroxine
D) Estrogen

✅ Correct Answer: B) Adrenaline

Explanation:

• A, C, D – Other functions.
• B) ✔ Adrenaline prepares body for emergency (“fight or flight” hormone).

Q13. Which hormone regulates blood sugar?

A) Estrogen
B) Testosterone
C) Insulin
D) Adrenaline

✅ Correct Answer: C) Insulin

Explanation:

• A, B, D – Not sugar regulators.
• C) ✔ Insulin lowers blood glucose.

Q14. The changes that occur at adolescence are controlled by:

A) Vitamins
B) Hormones
C) Blood
D) Genes only

✅ Correct Answer: B) Hormones

Explanation:

• A, C – Support but don’t control.
• B) ✔ Hormones cause puberty changes.
• D) Genes control inheritance, not immediate changes.

Q15. Which hormone is essential for normal growth of a person?

A) Growth hormone
B) Insulin
C) Adrenaline
D) Thyroxine

✅ Correct Answer: A) Growth hormone

Explanation:

• A) ✔ Pituitary growth hormone → height & development.
• B, C, D – Other roles.

Q16. The male hormone testosterone is secreted by:

A) Ovaries
B) Testes
C) Pituitary
D) Pancreas

✅ Correct Answer: B) Testes

Explanation:

• A) Ovaries → female hormones.
• B) ✔ Testes produce testosterone.
• C, D – Not related to testosterone.

Q17. The female hormone estrogen is secreted by:

A) Testes
B) Ovaries
C) Adrenal gland
D) Pancreas

✅ Correct Answer: B) Ovaries

Explanation:

• A) Male organ.
• B) ✔ Ovaries produce estrogen & progesterone.
• C, D – Other glands.

Q18. The onset of menstruation is called:

A) Menopause
B) Puberty
C) Menarche
D) Ovulation

✅ Correct Answer: C) Menarche

Explanation:

• A) Menopause → stopping of menstruation.
• B) General growth period.
• C) ✔ First menstrual cycle = menarche.
• D) Egg release.

Q19. The stoppage of menstruation in women is called:

A) Menarche
B) Puberty
C) Menopause
D) Fertilization

✅ Correct Answer: C) Menopause

Explanation:

• A) Beginning of menstruation.
• B) Growth phase.
• C) ✔ Menopause marks end of menstruation.
• **D) Different process.

Q20. Which gland controls growth and development in children?

A) Pancreas
B) Pituitary
C) Thyroid
D) Adrenal

✅ Correct Answer: B) Pituitary

Explanation:

• A, C, D – Other functions.
• B) ✔ Pituitary → growth hormone.

Q21. The voice box is also called:

A) Trachea
B) Larynx
C) Pharynx
D) Epiglottis

✅ Correct Answer: B) Larynx

Explanation:

• A, C, D – Parts of throat but not voice box.
• B) ✔ Larynx is voice box, deepens during puberty in boys.

Q22. Adam’s apple is more prominent in:

A) Girls
B) Boys
C) Children
D) Elderly

✅ Correct Answer: B) Boys

Explanation:

• A, C, D – Less noticeable.
• B) ✔ Testosterone enlarges larynx → Adam’s apple in boys.

Q23. Sudden increase in height during adolescence is due to:

A) Growth hormone
B) Insulin
C) Adrenaline
D) Thyroxine

✅ Correct Answer: A) Growth hormone

Explanation:

• A) ✔ Pituitary growth hormone accelerates height increase.
• B, C, D – Not responsible for height.

Q24. Which vitamin is produced in the skin in the presence of sunlight?

A) Vitamin A
B) Vitamin B
C) Vitamin C
D) Vitamin D

✅ Correct Answer: D) Vitamin D

Explanation:

• A, B, C – Not sunlight dependent.
• D) ✔ Sunlight triggers vitamin D production in skin.

Q25. Which of these is a secondary sexual character in boys?

A) Development of breasts
B) Broadening of pelvis
C) Growth of facial hair
D) Menstruation

✅ Correct Answer: C) Growth of facial hair

Explanation:

• A, B, D – Female traits.
• C) ✔ Facial hair growth is male secondary sexual character.

Reaching the Age Adolescence Class 8 MCQs, CBSE Class 8 Science MCQs, NCERT Class 8 Adolescence MCQs, Online Learning Science MCQs, Important MCQs Class 8, cbse class 8 science reaching the age of adolescence mcqs with answers, ncert class 8 reaching the age of adolescence objective questions, important mcqs for class 8 adolescence board exams, online learning mcqs for class 8 science adolescence, chapter wise mcqs for class 8 science reaching the age of adolescence