CBSE Class 8 Science – MCQ and Online Tests – Unit 10 – Reaching the Age of Adolescence
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CBSE Class 8 Science – MCQ and Online Tests – Unit 10 – Reaching the Age of Adolescence
Choose the correct option in the following questions:
Question 1.
The human body undergoes several changes during adolescence. These changes mark the onset of
(a) Puberty
(b) Prematurity
(c) Post adolescence
(d) ageing
Answer
Answer: (a) Puberty
Question 2.
Which hormone is secreted by adrenal glands?
(a) Adrenalin
(b) Insulin
(c) Testosterone
(d) Estrogen
Answer
Answer: (a) Adrenalin
Question 3.
Adam’s apple is prominent in
(a) Boys of any age
(b) Adolescent girls
(c) Girls of any age
(d) Adolescent boys
Answer
Answer: (d) Adolescent boys
Question 4.
Testes secrete
(a) thyroxin
(b) estrogen
(c) testosterone
(d) iodine
Answer
Answer: (c) testosterone
Question 5.
Adam’s apple is
(a) enlarged larynx
(b) mammary glands
(c) apple of adam
(d) red apple
Answer
Answer: (a) enlarged larynx
Question 6.
The chemical substances which are secreted from endocrine glands are called
(a) puberty
(b) hormones
(c) estrogen
(d) adolescence
Answer
Answer: (b) hormones
Question 7.
Out of these which one determines the sex of the baby?
(a) Hormones
(b) Chloroplast
(c) Chromosomes
(d) Pituitary gland
Answer
Answer: (c) Chromosomes
Question 8.
What is the stoppage of menstruation called?
(a) Menarche
(b) Menopause
(c) Gametes
(d) Insulin
Answer
Answer: (b) Menopause
Question 9.
Adolescence is the period of
(a) 5 to 10 years
(b) 11 to 19 years
(c) 22 to 28 years
(d) 30 to 40 years
Answer
Answer: (b) 11 to 19 years
Question 10.
When a sperm having X-chromosome fuses with the ovum, the child born will be
(a) male
(b) female
(c) male as well as female twin
(d) it depends on the chance of fusion
Answer
Answer: (b) female
Question 11.
Reproduction age in women starts when their
(a) menstruation starts
(b) breasts start developing
(c) body weight increases
(d) height increases
Answer
Answer: (a) menstruation starts
Question 12.
Which is male gonads?
(a) Hair
(b) Chest
(c) Moustache
(d) Testis
Answer
Answer: (d) Testis
Question 13.
The beginning of menstruation at puberty is called
(a) ovulation
(b) menstruation
(c) menarche
(d) menopause
Answer
Answer: (c) menarche
Question 14.
In males, the sex chromosome consists
(a) one X and one Y
(b) both X and X
(c) both Y and Y
(d) one M and one X
Answer
Answer: (a) one X and one Y
Question 15.
Production of thyroxin requires
(a) sodium
(b) magnesium
(c) iodine
(d) bromine
Answer
Answer: (c) iodine
Question 16.
The period of life, when the body undergoes changes, leading to reproductive maturity, is called
(a) childhood
(b) adolescence
(c) Grown up
(d) Old age
Answer
Answer: (b) adolescence
Question 17.
When a sperm containing Y chromosome fertilizes an egg with X chromosome, the zygote develops into a _____ child
(a) Female
(b) Either a male or female
(c) Male
(d) No child
Answer
Answer: (c) Male
Question 18.
The change from larvae to adult is called
(a) Metabolism
(b) Metamorphosis
(c) Metastasis
(d) Morphology
Answer
Answer: (b) Metamorphosis
Question 19.
Larynx is also called
(a) Voice box
(b) Sound box
(c) Black box
(d) All of the above
Answer
Answer: (a) Voice box
Question 20.
Acne and pimples on the face is due to secretion of
(a) bile from liver
(b) Oil glands during puberty
(c) Enzymes in the digestive tract
(d) Tear from tear glands
Answer
Answer: (b) Oil glands during puberty
Question 21.
Testosterone is a hormone found in human ___
(a) Children
(b) males and females
(c) Females only
(d) Males only
Answer
Answer: (d) Males only
Question 22.
The first menstrual flow is called
(a) Menstruation
(b) Mensuration
(c) Menarche
(d) Menopause
Answer
Answer: (c) Menarche
Question 23.
Menopause occurs at the age of
(a) 10-12 years in boys
(b) 45-50 years in men
(c) 10-12 years in girls
(d) 45-50 years in women
Answer
Answer: (d) 45-50 years in women
Question 24.
How many pairs of Chromosomes are found in nuclei of their cells?
(a) 22 pairs
(b) 23 pairs
(c) 24 pairs
(d) 25 pairs
Answer
Answer: (b) 23 pairs
Question 25.
Children gain height during
(a) adolescence
(b) endocrine
(c) balanced food
(d) menarche
Answer
Answer: (a) adolescence
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