8 BS FA 3 KEY 2025-26

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 Self Assessment Model Paper – 3 (2025-26)

Class : 8 | Subject : Biological Science

Section A : Multiple Choice Questions

1. Bodily changes like growth of beard and moustache, widening of shoulders and hoarseness of voice are observed in Ravi. Which hormone is responsible for the development of these characters?

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

Answer: B) Testosterone

2. Assertion (A): Girls generally reach puberty earlier than boys.

Reason (R): Estrogen production begins earlier in girls than that of Testosterone in boys.

A) Both A and R are true; R is correct explanation for A
B) Both A and R are true; R is not correct explanation for A
C) A is true, R is false
D) A is false, R is true

Answer: A) Both A and R are true; R is correct explanation for A

3. Which of the following mineral deficiencies causes goitre?

A) Iron
B) Vitamin-D
C) Calcium
D) Iodine

Answer: D) Iodine

4. Match the following



Answer: C) 1-c, 2-d, 3-b, 4-a

5. Four students made the following statements about how the sex of a child is determined in humans. Whose statement is correct?


A) Riya

B) Karan
C) Amit
D) Sneha

Answer: C) Amit

6. Which condition occurs in adolescents due to the increased activity of sweat and sebaceous glands?

A) Diabetes
B) Pimples
C) Asthma
D) Baldness

Answer: B) Pimples

7. For a school rally on creating awareness about the legal age for marriage, four poster designs were made. Which design is correct?


Answer: D (Boy 21 years, Girl 18 years)

8. Assertion (A): Hormones act at specific target sites in the body.

Reason (R): Hormones travel in blood to reach the target site.

A) Both A and R true; R correct explanation
B) Both A and R true; R not correct explanation
C) A true but R false
D) A false but R true

Answer: B

9. Identify the mismatched pair.

A) Menopause – Onset of reproductive maturity
B) Metamorphosis – controlled by thyroxine
C) Sex chromosomes – X, Y chromosomes
D) Puberty – Period of mental maturity

Answer: D

10. Which endocrine gland controls the onset of the puberty?

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

Answer: C) Pituitary

11. Which of the following best explains why adolescents should stay away from drugs?

A) They slow down growth and damage health
B) They cause dwarfism
C) They cause goitre
D) They cause obesity

Answer: A

12. At what age does adolescence generally begin in humans?

A) 5–7 years
B) 8–9 years
C) 10–11 years
D) 20 years

Answer: C) 10–11 years

13. The reproductive age in women begins with

A) Menstruation
B) Growth of hair
C) Menopause
D) Increase of height

Answer: A) Menstruation

14. Find the incorrect statement.

A) Adolescence lasts from 11 to 18/19 years
B) In girls puberty starts earlier than boys
C) Insulin is secreted by adrenal gland
D) Menopause refers to stoppage of menstrual cycle

Answer: C

15. Which of the following is considered as a balanced food for adolescents?

A) Chips and noodles
B) Chapathi, dal, vegetables
C) Burger and coke
D) Cutlet and lemon juice

Answer: B) Chapathi, dal, vegetables

Section B

16. Write any two slogans to create awareness about the harmful effects of early marriage and early motherhood.

Answer:

  1. Say NO to early marriage, say YES to a bright future.

  2. Education first, marriage later.

17. What suggestions would you give to your friend to stay away from drugs?

Answer:

  1. Avoid bad peer groups.

  2. Engage in sports and hobbies.

  3. Be aware of harmful effects of drugs.

  4. Seek guidance from parents and teachers.

Section C

18. Why are a balanced diet, personal hygiene and regular physical exercise important for maintaining good health?

Answer:

  1. Balanced diet provides nutrients for growth.

  2. Personal hygiene prevents diseases.

  3. Exercise keeps the body fit and strong.

  4. Maintains physical and mental health.

19. Identify X and write briefly about X and its functions.



Answer

X = Adam’s Apple

Functions:

  1. Gives deep voice to boys during puberty.

  2. Protects the voice box (larynx).

Section D

20. A) Describe the changes occur during the menstrual cycle.

Answer

  1. Ovary releases an egg (ovulation).

  2. Uterine lining thickens for pregnancy.

  3. If fertilization does not occur, uterine lining sheds as menstruation.

  4. The cycle repeats about every 28 days.

OR

B) Fill in the blanks


(I) Growth hormone

(II) Controls metabolism
(III) Pancreas
(IV) Adrenaline
(V) Development of male secondary sexual characters
(VI) Oestrogen

Sex hormones:

Male → Testosterone
Female → Oestrogen