CBSE Class 8 Science - Reaching the age of Adolescence (7)
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REACHING THE AGE OF ADOLESCENCE
1.Why should teenagers take a bath at least once everyday?
2.What are chromosomes?
3.What is the period of adolescence?
4.What do you understand by the term adolescence?
5.When does the puberty end?
6.What causes increase in height of the person during puberty?
7.Why is it necessary to eat right kind of food during the growing years?
8.What is the other name for voice box in males?
9.Why does the voice of boys become hoarse during the age of adolescence?
10.How many pairs of chromosomes are there in the cells of human beings?
11.What determines the sex of an unborn baby?
12.Why is iron necessary for the body?
13.Name the male and female hormones that are secreted at the onset of puberty
14.What is the function of mammary glands?
15.Name the gland whose secretion control the secretion of sex hormones.
16.Name the hormone that causes metamorphosis in frogs.
17.What will be the sex of the individual with sex chromosomes as XY?
18.What is the period of reproductive phase in females?
19.There are ___ pairs of chromosomes in human cells
(A) 21 (B) 22 (C) 23 (D) 24
20.End of menstruation is called:
(A) Puberty (B) Menarche (C) Menopause (D) Adolescence
21.Adolescence begins around the age of:
(A) 8-9 years (B) 11-12 years (C) 13-14 years (D) 15-16 years
22.Adolescence lasts upto the age of:
(A) 18-19 years (B) 21-22 years (C) 23-24 years (D) 25-26 years
23.Organs that secrete Estrogen are:
(A) Testes (B) Ovaries (C) Pituitary (D) Adrenals
24.After puberty, boys and girls become capable of:
(A) Respiration (B) Marriage (C) Reproduction (D) Moving out
25.Percentage of full height at the age of 15 years in girls is:
(A) 90% (B) 95% (C) 98% (D) 99%
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