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Class 8 Science Study Material

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Reaching the Age of Adolescence

The number of pairs of chromosomes in human cells is

a) 21
b) 22
c) 23
d) 24

✔Answer

✔Solution

Correct Answer Is : 23

Solution Is : Chromosomes are the thread like structures that contain information about an individual. In humans, each cell contains 23 pairs of chromosomes.

End of menstruation is called

a) Puberty.
b) Menarche.
c) Menopause.
d) Adolescence.

✔Answer

✔Solution

Correct Answer Is : Menopause.

Solution Is : Menstruation is a regular flow of blood from uterus. It starts at the start of puberty. Start of flow is called menarche and end of the flow of blood is called menopause.

Adolescence begins around the age of

a) 8-9 years.
b) 11-12 years.
c) 13-14 years.
d) 15-16 years.

✔Answer

✔Solution

Correct Answer Is : 11-12 years.

Solution Is : Adolescence is the stage of life cycle when changes come in the body of the individual. It begins around the age of 11-12 years.

Adolescence lasts upto the age of

a) 18-19 years.
b) 21-22 years.
c) 23-24 years.
d) 25-26 years.

✔Answer

✔Solution

Correct Answer Is : 18-19 years.

Solution Is : Adolescence is the stage of life cycle when changes come in the body of the individual. It begins around the age of 11-12 years and ends at the age of 18-19 years.

Organs that secrete estrogen are

a) Testes.
b) Ovaries.
c) Pituitary glands.
d) Adrenals.

✔Answer

✔Solution

Correct Answer Is : Ovaries.

Solution Is : Estrogen is the hormone secreted by ovaries in females. Estrogen helps in the development of ova in females.

After puberty, boys and girls become capable of

a) Respiration.
b) Marriage.
c) Reproduction.
d) Excretion.

✔Answer

✔Solution

Correct Answer Is : Reproduction.

Solution Is : During puberty, changes occur in the structure and function of reproductive system that finally makes an individual capable of reproduction.

The percentage of girls who gain their full height at the age of 15 is

a) 90%.
b) 95%.
c) 98%.
d) 99%.

✔Answer

✔Solution

Correct Answer Is : 99%.

Solution Is : The increase in the height of a person occurs because of the growth of bones, upto a particular age.

With respect to growth in man the

a) Rate is
b) Height depends entirely on the nutritional status.
c) Growth takes place
d) Puberty occurs at 12-14 years.

✔Answer

✔Solution

Correct Answer Is : Puberty occurs at 12-14 years.

Solution Is : Growth takes place during the stage of adolescence. It varies from person to person and also from part to part. The height attained by an individual depends on the genes inherited from the parents and environmental factors. The physical changes which prepare the body for reproduction occur at the age of 12-14 yrs.

The statement that is false is that

a) Drugs are addictive.
b) Drugs harm our body.
c) Drugs ruin health and happiness
d) Drugs should be used by everyone.

✔Answer

✔Solution

Correct Answer Is : Drugs should be used by everyone.

Solution Is : Drugs are harmful to the health of a person. So, these should not be taken without medical advice.

Voice boxes in boys are

a) Larger than voice boxes in females.
b) Smaller than voice boxes in girls.
c) Equal in size to the voice box of girls.
d) Very big in size.

✔Answer

✔Solution

Correct Answer Is : Larger than voice boxes in females.

Solution Is : During adolescence, there is increase in the size of the voice box. The increase in size is more in boys; hence, voice box of boys are larger than the voice box of girls.

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Class 8 Science Study Material

Reaching the Age of Adolescence

The number of pairs of chromosomes in human cells is

Correct Answer Is : 23

Solution Is : Chromosomes are the thread like structures that contain information about an individual. In humans, each cell contains 23 pairs of chromosomes.

End of menstruation is called

Correct Answer Is : Menopause.

Solution Is : Menstruation is a regular flow of blood from uterus. It starts at the start of puberty. Start of flow is called menarche and end of the flow of blood is called menopause.

Adolescence begins around the age of

Correct Answer Is : 11-12 years.

Solution Is : Adolescence is the stage of life cycle when changes come in the body of the individual. It begins around the age of 11-12 years.

Adolescence lasts upto the age of

Correct Answer Is : 18-19 years.

Solution Is : Adolescence is the stage of life cycle when changes come in the body of the individual. It begins around the age of 11-12 years and ends at the age of 18-19 years.

Organs that secrete estrogen are

Correct Answer Is : Ovaries.

Solution Is : Estrogen is the hormone secreted by ovaries in females. Estrogen helps in the development of ova in females.

After puberty, boys and girls become capable of

Correct Answer Is : Reproduction.

Solution Is : During puberty, changes occur in the structure and function of reproductive system that finally makes an individual capable of reproduction.

The percentage of girls who gain their full height at the age of 15 is

Correct Answer Is : 99%.

Solution Is : The increase in the height of a person occurs because of the growth of bones, upto a particular age.

With respect to growth in man the

Correct Answer Is : Puberty occurs at 12-14 years.

The statement that is false is that

Correct Answer Is : Drugs should be used by everyone.

Solution Is : Drugs are harmful to the health of a person. So, these should not be taken without medical advice.

Voice boxes in boys are

Correct Answer Is : Larger than voice boxes in females.

Solution Is : During adolescence, there is increase in the size of the voice box. The increase in size is more in boys; hence, voice box of boys are larger than the voice box of girls.

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