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Reaching the Age of Adolescence

Female voice is normally

a) Deep.
b) High-pitched.
c) Low-pitched.
d) Loud.

✔Answer

✔Solution

Correct Answer Is : High-pitched.

Solution Is : Female voice is usually high-pitched, in contrast to the male voice, which is usually low-pitched. This difference is due to the structure of the voice box and the mechanism by which voice is produced.

Sebaceous glands secrete

a) Sweat.
b) Oily secretion
c) Hormones.
d) Water.

✔Answer

✔Solution

Correct Answer Is : Oily secretion

Solution Is : Sebaceous glands secrete oily secretion. Sweat is secreted by sweat glands. Hormones are secreted by endocrine glands.

Male sex organs include

a) Testes and penis.
b) Ovaries and fallopian tube.
c) Testes and ovaries.
d) Testes and fallopian tube.

✔Answer

✔Solution

Correct Answer Is : Testes and penis.

Solution Is : Male sex organs are testes and penis, whereas ovaries and fallopian tube are the female sex organs.

Gametes are produced by

a) Seminal duct.
b) Testis.
c) Uterus.
d) Fallopian tubes.

✔Answer

✔Solution

Correct Answer Is : Testis.

Solution Is : Male and female sex organs are testes and ovaries respectively. Both of these are involved in the development of gametes. Testes develop male gametes and ovaries develop female gametes.

The development of facial hair is a

a) Primary sexual character.
b) Secondary sexual character.
c) Vegetative character.
d) Adult character.

✔Answer

✔Solution

Correct Answer Is : Secondary sexual character.

Solution Is : The characters that help to distinguish between the males and females are called as secondary sexual characters. Facial hair is one of these characters.

Chemical substances that control changes during adolescence are

a) Fats.
b) Sweat.
c) Oily secretions.
d) Hormones.

✔Answer

✔Solution

Correct Answer Is : Hormones.

Solution Is : Sebaceous glands secrete oily secretion. Sweat is secreted by sweat glands. Hormones are chemicals that control changes during adolescence. These are secreted by endocrine glands.

Legal age of marriage for girls in India is

a) 17 years.
b) 18 years.
c) 20 years.
d) 21 years.

✔Answer

✔Solution

Correct Answer Is : 18 years.

Solution Is : Legal marriage of girls in India is 18 years because prior to this age, a girl is not prepared mentally and physically for motherhood.

The legal age of marriage for boys in India is

a) 17 years.
b) 18 years.
c) 20 years.
d) 21 years.

✔Answer

✔Solution

Correct Answer Is : 21 years.

Solution Is : The Indian Constitution recognises the marriageable age for boys as 21 years and for girls as 18 years.

A virus that causes AIDS is

a) HVV.
b) HIV.
c) IHV.
d) HAV.

✔Answer

✔Solution

Correct Answer Is : HIV.

Solution Is : AIDS is a sexual disease, caused by a virus called HIV (Human Immunodeficiency Virus). This virus attacks the immune system of the body.

AIDS can be transmitted through

a) Physical contact
b) Contaminated food.
c) Sexual contact.
d) Contaminated water

✔Answer

✔Solution

Correct Answer Is : Sexual contact.

Solution Is : AIDS is a sexual disease caused by a virus called HIV (Human Immunodeficiency Virus). It is transmitted through sexual contact. It does not spread through contaminated water, air or food.

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Class 8 Science Study Material

Reaching the Age of Adolescence

Female voice is normally

Correct Answer Is : High-pitched.

Solution Is : Female voice is usually high-pitched, in contrast to the male voice, which is usually low-pitched. This difference is due to the structure of the voice box and the mechanism by which voice is produced.

Sebaceous glands secrete

Correct Answer Is : Oily secretion

Solution Is : Sebaceous glands secrete oily secretion. Sweat is secreted by sweat glands. Hormones are secreted by endocrine glands.

Male sex organs include

Correct Answer Is : Testes and penis.

Solution Is : Male sex organs are testes and penis, whereas ovaries and fallopian tube are the female sex organs.

Gametes are produced by

Correct Answer Is : Testis.

Solution Is : Male and female sex organs are testes and ovaries respectively. Both of these are involved in the development of gametes. Testes develop male gametes and ovaries develop female gametes.

The development of facial hair is a

Correct Answer Is : Secondary sexual character.

Solution Is : The characters that help to distinguish between the males and females are called as secondary sexual characters. Facial hair is one of these characters.

Chemical substances that control changes during adolescence are

Correct Answer Is : Hormones.

Solution Is : Sebaceous glands secrete oily secretion. Sweat is secreted by sweat glands. Hormones are chemicals that control changes during adolescence. These are secreted by endocrine glands.

Legal age of marriage for girls in India is

Correct Answer Is : 18 years.

Solution Is : Legal marriage of girls in India is 18 years because prior to this age, a girl is not prepared mentally and physically for motherhood.

The legal age of marriage for boys in India is

Correct Answer Is : 21 years.

Solution Is : The Indian Constitution recognises the marriageable age for boys as 21 years and for girls as 18 years.

A virus that causes AIDS is

Correct Answer Is : HIV.

Solution Is : AIDS is a sexual disease, caused by a virus called HIV (Human Immunodeficiency Virus). This virus attacks the immune system of the body.

AIDS can be transmitted through

Correct Answer Is : Sexual contact.

Solution Is : AIDS is a sexual disease caused by a virus called HIV (Human Immunodeficiency Virus). It is transmitted through sexual contact. It does not spread through contaminated water, air or food.

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