Chapter 10 Reaching the Age of Adolescence mcqs & important questions science | class 8th

MCQ Questions for Class 8 Science: Ch 10 Reaching the Age of Adolescence

1. The chemical substances which are secreted from endocrine glands are called

(a) puberty

(b) hormones

(c) estrogen

(d) adolescence

► (b) hormones

2. How many pairs of Chromosomes are found in nuclei of their cells?

(a) 22 pairs

(b) 23 pairs

(c) 24 pairs

(d) 25 pairs

► (b) 23 pairs

3. Which of the following will occur in females at puberty?

(a) Ovulation

(b) Enlargement of breasts

(c) Broadening of hips

(d) All of these

► (d) All of these

4. Puberty ends when an adolescent reaches

(a) Reproductive maturity

(b) Physical maturity

(c) Birth maturity

(d) Growth maturity

► (a) Reproductive maturity

5. The menstrual cycle stops in a women at about 50 years old. The woman is said to have reached

(a) puberty.

(b) menopause.

(c) menarche.

(d) adolescence.

► (b) menopause.

6. Which of the following does not take place during the final stage of the menstrual cycle?

(a) Further thickening of the uterine lining.

(b) Repair and growth of the uterine lining.

(c) Ovulation.

(d) Both (B) and (C)

► (c) Ovulation.

7. Which one is another terms for teenage is

(a) Maturity

(b) Puberty

(c) Adolescence

(d) Thyroid

► (c) Adolescence

8. Larynx is called

(a) Voice Box

(b) Music Box

(c) Respiratory organ

(d) None of these

► (a) Voice Box

9. Glands without ducts

(a) Mammary gland

(b) Exocrine gland

(c) Endocrine glands

(d) Pancreatic gland

► (c) Endocrine glands

10. Sebaceous gland is also known as

(a) Pancreatic gland

(b) Oil gland

(c) Sweat gland

(d) Mater gland

► (b) Oil gland

11. Thyroxine is produced by

(a) Pituitary gland

(b) Adrenal gland

(c) Thyroid gland

(d) Testes

► (c) Thyroid gland

12. In girls, secondary sexual characteristics develop between

(a) 9 and 11 years.

(b) 11 and 14 years.

(c) 15 and 18 years.

(d) 19 and 21 years.

► (b) 11 and 14 years.

13. Adolescence begins around the age of

(a) 18 years

(b) 13 years

(c) 25 years

(d) 11 years

► (d) 11 years

14. The most clearly visible change during puberty is the

(a) Sudden change of hip size

(b) Sudden formation of breast

(c) Slow growth of head

(d) Sudden increase in height

► (d) Sudden increase in height

15. Initially girls grow _____ than boys.

(a) Faster

(b) Slower

(c) Both of these

(d) None of these

► (a) Faster

16. In general, boys have a Low pitch voice while the girls have

(a) Low pitch voice

(b) Hoarse voice

(c) Deep voice

(d) High pitch voice

► (d) High pitch voice

17. Progesterone level falls during

(a) Menopause

(b) Lactation

(c) Gestation

(d) Menstruation

► (a) Menopause

18. Which among the boys and girls puberty starts earlier?

(a) Any one

(b) Boys

(c) Girls

(d) Both together

► (c) Girls

19. Incomplete development of male secondary sexual characteristics is caused due to deficiency in?

(a) Estrogen.

(b) Progesterone.

(c) Adrenaline.

(d) Testosterone.

► (d) Testosterone.

20. Which of the following is NOT a secondary sexual characteristic feature of girls?

(a) The enlargement of breasts.

(b) The deepening of voice.

(c) The menstruation begins.

(d) The growth of hair at armpit.

► (b) The deepening of voice.

21. Deficiency of which hormone cause diabetes?

(a) Insulin

(b) Estrogen

(c) Testosterone

(d) Thyroxin

► (a) Insulin

22. Puberty age in females is

(a) 10 to 12 years

(b) 12 to 14 years

(c) 8 to 10 years

(d) More than 14 years.

► (a) 10 to 12 years

23. Menstrual cycle is controlled by

(a) Time duration

(b) Physical activity

(c) Food habit

(d) Hormones

► (d) Hormones

24. The right meals for adolescents consist of

(a) Chips, noodles, coke

(b) Rice, noodles and burger

(c) Chapatti, dal, vegetable

(d) Vegetable cutlets, chips and lemon drink

► (c) Chapatti, dal, vegetable

25. Which chromosomes determine the sex of an individual?

(a) Autosomes

(b) Allosomes

(c) Plasmid

(d) Giant chromosomes

► (b) Allosomes

26. Which of the following statements is true?

(a) Boys reach puberty at an earlier age than girls.

(b) Girls reach puberty earlier than boys.

(c) At the end of rapid growth, girls are normally heavier than boys.

(d) Between the age of 4 to 12, girls grow faster than boys.

► (b) Girls reach puberty earlier than boys.

Class 8 Science Chapter 10 Extra Questions and Answers Reaching the Age of Adolescence

Extra Questions for Class 8 Science Chapter 10 Reaching the Age of Adolescence with Answers Solutions

Reaching the Age of Adolescence Class 8 Extra Questions Very Short Answer Type

Question 1.
What is Adam’s apple?
Answer:
The protruding part of the throat in males is called Adam’s apple.

Question 2.
Name the hormone in female that is produced by ovaries and helps in development of mammary glands.
Answer:
Estrogen

Question 3.
Whose height grow faster initially boys or girls?
Answer:
Girls

Question 4.
Name a gland which transports secretions through ducts.
Answer:
Sweat glands/salivary glands/ oil gland (any one).

Question 5.
What is puberty?
Answer:
The age at which boys and girls become capable of reproduction.

Question 6.
What are hormones?
Answer:
The chemical substances produced by endocrine glands are called hormones.

Question 7.
How long is a woman’s reproductive life lasts?
Answer:
Menarche to menopause.

Question 8.
Name the female hormone.
Answer:
Estrogen

Question 9.
Which gland is called master gland?
Answer:
Pituitary gland

Question 10.
What is a balanced diet?
Answer:
The meal that includes all nutrients is called a balanced diet.

Question 11.
What is menstruation?
Answer:
Extrusion of uterus lining and blood along with the unfertilised egg from the vagina is called menstruation.

Question 12.
What is menarche?
Answer:
The first menstrual flow begins at puberty and is termed as menarche.

Question 13.
What is menopause?
Answer:
Stoppage of menstruation is called menopause.

Question 14.
What causes goitre?
Answer:
Deficiency of thyroxine hormone.

Question 15.
Which gland secretes thyroxine?
Answer:
Thyroid gland

Question 16.
What are chromosomes?
Answer:
The thread-like structures in the nucleus are called chromosomes.

Question 17.
How many chromosomes are present in human cell?
Answer:
23 pairs or 46 chromosomes.

Question 18.
How many sex chromosomes are there in human cell?
Answer:
Two, i.e., one pair.

Question 19.
Which hormone is necessary for normal growth of a person?
Answer:
Growth hormone.

Question 20.
Which gland secretes insulin?
Answer:
Pancreas

Question 21.
What causes diabetes?
Answer:
Deficiency of insulin.

Question 22.
Name the chromosome present in a female.
Answer:
X chromosome

Question 23.
Name the chromosome present in a male.
Answer:
X and Y chromosomes

Question 24.
Which chromosome does the unfertilised egg contain?
Answer:
X chromosome

Question 25.
Which hormone balances the proportion of salts in the blood?
Answer:
Adrenaline

Question 26.
What decides the sex of an unborn child?
Answer:
Sex chromosome of father.

Question 27.
Name the glands other than the pituitary gland.
Answer:
Thyroid, pancreas and adrenals.

Question 28.
When does the puberty ends?
Answer:
Puberty ends when an adolescent reaches reproductive maturity.

Question 29.
Do the boys and girls undergo same physical changes at puberty?
Answer:
No

Question 30.
Why do we need to have a balanced diet?
Answer:
To keep the body healthy.