Wednesday, 24 February 2021

CBSE Class 8 Science - MCQ and Online Tests - Unit 10 - Reaching the Age of Adolescence

CBSE Class 8 Science – MCQ and Online Tests –  Unit 10 – Reaching the Age of Adolescence

Every year CBSE students attend Annual Assessment exams for 6,7,8,9,11th standards. These exams are very competitive to all the students. So our website provides online tests for all the 6,7,8,9,11th standards’ subjects. These tests are also very effective and useful for those who preparing for any competitive exams like Olympiad etc. It can boost their preparation level and confidence level by attempting these chapter wise online tests.

These online tests are based on latest CBSE syllabus. While attempting these, our students can identify their weak lessons and continuously practice those lessons for attaining high marks. It also helps to revise the NCERT textbooks thoroughly


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: (a) Puberty

Question 2.
Which hormone is secreted by adrenal glands?
(a) Adrenalin
(b) Insulin
(c) Testosterone
(d) Estrogen


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: (d) Adolescent boys

Question 4.
Testes secrete
(a) thyroxin
(b) estrogen
(c) testosterone
(d) iodine


Answer: (c) testosterone

Question 5.
Adam’s apple is
(a) enlarged larynx
(b) mammary glands
(c) apple of adam
(d) red apple


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: (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: (c) Chromosomes

Question 8.
What is the stoppage of menstruation called?
(a) Menarche
(b) Menopause
(c) Gametes
(d) Insulin


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: (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: (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: (a) menstruation starts

Question 12.
Which is male gonads?
(a) Hair
(b) Chest
(c) Moustache
(d) Testis


Answer: (d) Testis

Question 13.
The beginning of menstruation at puberty is called
(a) ovulation
(b) menstruation
(c) menarche
(d) menopause


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: (a) one X and one Y

Question 15.
Production of thyroxin requires
(a) sodium
(b) magnesium
(c) iodine
(d) bromine


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: (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: (c) Male

Question 18.
The change from larvae to adult is called
(a) Metabolism
(b) Metamorphosis
(c) Metastasis
(d) Morphology


Answer: (b) Metamorphosis

Question 19.
Larynx is also called
(a) Voice box
(b) Sound box
(c) Black box
(d) All of the above


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: (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: (d) Males only

Question 22.
The first menstrual flow is called
(a) Menstruation
(b) Mensuration
(c) Menarche
(d) Menopause


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: (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: (b) 23 pairs

Question 25.
Children gain height during
(a) adolescence
(b) endocrine
(c) balanced food
(d) menarche


Answer: (a) adolescence



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