Puberty Changes MCQs Class 8
Puberty Changes MCQs – Class 8 Science
CBSE Board Examination Practice
Class: 8
Subject: Science
Section: Reaching the Age of Adolescence
Topic: Puberty Changes MCQs
Subject: Science
Section: Reaching the Age of Adolescence
Topic: Puberty Changes MCQs
These Multiple Choice Questions (MCQs) are designed strictly as per the NCERT syllabus, making them ideal for CBSE Class 8 Science examination standard.
1. The period of life when the body undergoes changes leading to reproductive maturity is called:
Answer: B. Adolescence
Explanation: Adolescence is the transitional phase between childhood and adulthood during which the body develops reproductive capability. It includes physical, emotional, and hormonal changes that prepare the individual for maturity.
Explanation: Adolescence is the transitional phase between childhood and adulthood during which the body develops reproductive capability. It includes physical, emotional, and hormonal changes that prepare the individual for maturity.
2. Puberty usually begins at the age of:
Answer: C. 10–12 years
Explanation: Puberty generally starts between ages 10 and 12, though it may vary. Hormonal activity increases, initiating physical and reproductive changes.
Explanation: Puberty generally starts between ages 10 and 12, though it may vary. Hormonal activity increases, initiating physical and reproductive changes.
3. The hormone responsible for the development of male secondary sexual characters is:
Answer: B. Testosterone
Explanation: Testosterone is secreted by the testes and controls changes such as facial hair growth, deepening of voice, and muscle development.
Explanation: Testosterone is secreted by the testes and controls changes such as facial hair growth, deepening of voice, and muscle development.
4. Growth of breasts in girls is an example of:
Answer: B. Secondary sexual character
Explanation: Secondary sexual characters appear during puberty and distinguish males and females physically but are not directly involved in reproduction.
Explanation: Secondary sexual characters appear during puberty and distinguish males and females physically but are not directly involved in reproduction.
5. The first menstrual flow in girls is called:
Answer: C. Menarche
Explanation: Menarche marks the beginning of menstruation and indicates that the female reproductive system has started functioning.
Explanation: Menarche marks the beginning of menstruation and indicates that the female reproductive system has started functioning.
6. Sudden increase in height during puberty is known as:
Answer: A. Growth spurt
Explanation: Adolescents experience rapid height and weight increase due to hormonal influence and bone growth.
Explanation: Adolescents experience rapid height and weight increase due to hormonal influence and bone growth.
7. Change in voice in boys is due to growth of:
Answer: B. Larynx
Explanation: Enlargement of the larynx (voice box) makes boys’ voices deeper and sometimes causes voice cracking.
Explanation: Enlargement of the larynx (voice box) makes boys’ voices deeper and sometimes causes voice cracking.
8. Hair growth in armpits and pubic region is controlled by:
Answer: B. Sex hormones
Explanation: Testosterone and estrogen stimulate hair growth in specific body regions during puberty.
Explanation: Testosterone and estrogen stimulate hair growth in specific body regions during puberty.
9. Pimples during adolescence occur due to:
Answer: A. Increased oil gland activity
Explanation: Hormones activate sebaceous glands, producing excess oil that clogs pores, leading to pimples.
Explanation: Hormones activate sebaceous glands, producing excess oil that clogs pores, leading to pimples.
10. The reproductive organs become functional during:
Answer: B. Puberty
Explanation: Hormonal signals activate reproductive organs, enabling production of gametes.
Explanation: Hormonal signals activate reproductive organs, enabling production of gametes.
11. Estrogen is produced in:
Answer: B. Ovaries
Explanation: Estrogen regulates female secondary sexual characters and menstrual cycle.
Explanation: Estrogen regulates female secondary sexual characters and menstrual cycle.
12. Which gland controls puberty hormones?
Answer: A. Pituitary gland
Explanation: Known as the master gland, it releases hormones that regulate testes and ovaries.
Explanation: Known as the master gland, it releases hormones that regulate testes and ovaries.
13. Broadening of shoulders occurs in:
Answer: B. Boys only
Explanation: Testosterone promotes muscle and bone growth, leading to broader shoulders.
Explanation: Testosterone promotes muscle and bone growth, leading to broader shoulders.
14. Widening of hips is seen in:
Answer: B. Girls
Explanation: Estrogen prepares the female body for childbirth by widening the pelvic region.
Explanation: Estrogen prepares the female body for childbirth by widening the pelvic region.
15. Emotional changes during adolescence are due to:
Answer: B. Hormonal changes
Explanation: Hormonal fluctuations affect mood, behavior, and emotional responses.
Explanation: Hormonal fluctuations affect mood, behavior, and emotional responses.
16. The age of adolescence extends roughly up to:
Answer: C. 19 years
Explanation: WHO defines adolescence from 10 to 19 years of age.
Explanation: WHO defines adolescence from 10 to 19 years of age.
17. Adam’s apple is more prominent in:
Answer: B. Boys
Explanation: Enlargement of the larynx makes the Adam’s apple visible in boys.
Explanation: Enlargement of the larynx makes the Adam’s apple visible in boys.
18. Production of sperms begins at:
Answer: B. Puberty
Explanation: Testes become active during puberty and start producing sperms.
Explanation: Testes become active during puberty and start producing sperms.
19. Which nutrient is essential for healthy growth during adolescence?
Answer: B. Proteins
Explanation: Proteins help in tissue building, muscle growth, and overall development.
Explanation: Proteins help in tissue building, muscle growth, and overall development.
20. Personal hygiene during puberty is important to prevent:
Answer: B. Infections
Explanation: Increased sweat and oil secretion can cause bacterial growth; hygiene prevents infections and body odor.
Explanation: Increased sweat and oil secretion can cause bacterial growth; hygiene prevents infections and body odor.
