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

Part 3: Q51–Q75

Q51. Which hormone controls sugar levels in blood?

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

✅ Correct Answer: A) Insulin

Explanation:

• A) ✔ Insulin regulates blood sugar by allowing glucose to enter cells.
• B, C, D – Other hormones with different roles.

Q52. Which of the following is a communicable disease?

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

✅ Correct Answer: B) AIDS

Explanation:

• A, C, D – Non-communicable diseases.
• B) ✔ AIDS is spread through virus transmission.

Q53. Which hormone helps in body metabolism and growth?

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

✅ Correct Answer: B) Thyroxine

Explanation:

• A, C, D – Not growth regulators.
• B) ✔ Thyroxine maintains metabolism and normal growth.

Q54. Which of these is NOT a change in girls during puberty?

A) Broadening of shoulders
B) Menstruation begins
C) Development of breasts
D) Enlargement of uterus and ovaries

✅ Correct Answer: A) Broadening of shoulders

Explanation:

• A) ✔ Broad shoulders occur in boys.
• B, C, D – Correct female puberty changes.

Q55. What is the role of the pituitary gland?

A) Only controls digestion
B) Controls growth and regulates other glands
C) Produces insulin
D) Produces adrenaline

✅ Correct Answer: B) Controls growth and regulates other glands

Explanation:

• A, C, D – Functions of other organs.
• B) ✔ Pituitary = master gland.

Q56. Which hormone is secreted by testes?

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

✅ Correct Answer: C) Testosterone

Explanation:

• A, B – Female hormones.
• C) ✔ Testosterone controls male puberty changes.
• D – Thyroid hormone.

Q57. Which organ system is mainly influenced during puberty?

A) Circulatory system
B) Reproductive system
C) Nervous system
D) Digestive system

✅ Correct Answer: B) Reproductive system

Explanation:

• A, C, D – Less affected.
• B) ✔ Reproductive organs mature during puberty.

Q58. Which hormone is responsible for ovulation and pregnancy support?

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

✅ Correct Answer: B) Progesterone

Explanation:

• A) Estrogen → secondary traits.
• B) ✔ Progesterone prepares uterus, supports pregnancy.
• C, D – Not related.

Q59. Which of the following is a secondary sexual character in boys?

A) Menstruation
B) Development of breasts
C) Deepening of voice
D) Broadening of pelvis

✅ Correct Answer: C) Deepening of voice

Explanation:

• A, B, D – Female traits.
• C) ✔ Voice deepens in boys at puberty.

Q60. Which gland secretes adrenaline, the emergency hormone?

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

✅ Correct Answer: B) Adrenal gland

Explanation:

• A, C, D – Other hormones.
• B) ✔ Adrenal → “fight or flight” hormone.

Q61. The voice becomes hoarse and deep in boys during puberty because:

A) Increase in lung capacity
B) Growth of Adam’s apple
C) Weak vocal cords
D) Narrowing of trachea

✅ Correct Answer: B) Growth of Adam’s apple

Explanation:

• A, C, D – Not primary reasons.
• B) ✔ Enlarged larynx → Adam’s apple causes deeper voice.

Q62. Which hormone prepares the body to face stress or danger?

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

✅ Correct Answer: B) Adrenaline

Explanation:

• A, C, D – Not stress hormones.
• B) ✔ Adrenaline raises heartbeat, breathing, blood supply to muscles.

Q63. Which organ secretes estrogen?

A) Ovaries
B) Testes
C) Adrenal glands
D) Pituitary

✅ Correct Answer: A) Ovaries

Explanation:

• A) ✔ Estrogen secreted by ovaries controls female puberty.
• B, C, D – Other hormones.

Q64. Which of these is an endocrine gland?

A) Sweat gland
B) Sebaceous gland
C) Pancreas
D) Salivary gland

✅ Correct Answer: C) Pancreas

Explanation:

• A, B, D – Exocrine glands.
• C) ✔ Pancreas is both endocrine (insulin) and exocrine.

Q65. Which of the following is NOT a change during puberty?

A) Change in body shape
B) Development of reproductive organs
C) Decrease in height
D) Change in voice

✅ Correct Answer: C) Decrease in height

Explanation:

• A, B, D – Real changes.
• C) ✔ Height increases, not decreases.

Q66. The term menarche refers to:

A) Stoppage of menstruation
B) First menstrual cycle
C) Release of ovum
D) Growth of breasts

✅ Correct Answer: B) First menstrual cycle

Explanation:

• A) Menopause.
• B) ✔ Menarche is onset of menstruation.
• C, D – Different processes.

Q67. The term menopause refers to:

A) First menstrual cycle
B) Permanent stoppage of menstruation
C) Ovulation
D) Fertilization

✅ Correct Answer: B) Permanent stoppage of menstruation

Explanation:

• A, C, D – Not correct.
• B) ✔ Menopause occurs around 45–50 years.

Q68. Which disease is caused due to lack of iodine?

A) Goitre
B) Diabetes
C) AIDS
D) Rickets

✅ Correct Answer: A) Goitre

Explanation:

• A) ✔ Goitre caused by iodine deficiency (thyroid enlargement).
• B, C, D – Caused by other deficiencies.

Q69. Which hormone is necessary for proper physical growth in children?

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

✅ Correct Answer: A) Growth hormone

Explanation:

• A) ✔ Growth hormone regulates height and development.
• B, C, D – Other functions.

Q70. Which hormone prepares the uterus for pregnancy?

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

✅ Correct Answer: B) Progesterone

Explanation:

• A, C, D – Not correct.
• B) ✔ Progesterone maintains uterine lining.

Q71. The time between 11–19 years of age is called:

A) Puberty
B) Adolescence
C) Infancy
D) Adulthood

✅ Correct Answer: B) Adolescence

Explanation:

• A) Puberty is part of adolescence.
• B) ✔ Adolescence = 11 to 19 years.
• C, D – Other stages of life.

Q72. Which of the following is an example of an exocrine gland?

A) Thyroid
B) Pancreas
C) Sweat gland
D) Pituitary

✅ Correct Answer: C) Sweat gland

Explanation:

• A, B, D – Endocrine roles.
• C) ✔ Sweat gland releases secretion outside body.

Q73. Which is NOT a secondary sexual character in girls?

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

✅ Correct Answer: D) Growth of facial hair

Explanation:

• A, B, C – Correct female traits.
• D) ✔ Facial hair is male characteristic.

Q74. Which hormone regulates calcium and phosphorus balance in the body?

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

✅ Correct Answer: B) Calcitonin

Explanation:

• A, C, D – Other functions.
• B) ✔ Calcitonin secreted by thyroid maintains calcium levels.

Q75. Which hormone regulates female secondary sexual characters?

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

✅ Correct Answer: A) Estrogen

Explanation:

• A) ✔ Estrogen controls female puberty traits.
• B, C, D – Other functions.

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