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Question-1 We need to include __________ in our diet so that we get enough iodine to produce thyroxin.

(A) Fruits and junk foods.	(B) Sea foods and vegetables.
(C)Chips and colas	(D)Egg and meat

Question-2 Chemicals produced by ants which help them to coordinate each other are known as

(A) Hormones	(B)Enzymes
(C)Coordinators	(D)Pheromones.

Question-3 How are the last pair of chromosome different in their function in Human beings?

(A) They give us strength.	(B) They influence our behaviour
(C)They gives us long life.	(D)They influence/ determine our sex.

Question-4 __________ marks the end of reproductive phase in the life of human female.

(A) Menstruation	(B)Menarche
(C)Menopause	(D)Ovulation

Question-5 Gigantism and dwarfism are hormone disorders related with the endocrine gland/glands -

(A) Pituitary and thyroid glands.	(B)Pituitary gland alone.
(C)Thyroid gland alone	(D)Pancreas and adrenal glands.

Question-6 Drastic changes which develop in a tadpole converting, it into an adult frog is known as

(A) Mounting	(B) Ecdysis
(C)Metabolism	(D)Metamorphosis

Question-7 Adolescent age is between the years -

(A) 11 to 18	(B)11 to 25
(C)10 to 15	(D) 8 to 20

Question-8 What are the two different types of Sex chromosomes in Human beings?

(A) X and X	(B)Y and Y
(C)X and Y	(D)X and Z.

Question-9 Temperature is a determining factor of sex in

(A) Fishes	(B)Reptiles
(C)Birds	(D)Mammals

Question-10 Hormones produce their effect on -

(A) Heart and brain	(B) Whole body
(C)Target organs/sites	(D)Endocrine glands.

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Std 8

CBSE

Practice in Related Chapters
Reproduction in Animals
Microorganisms: Friend and Foe
Reaching the Age of Adolescence
Cell - Structure and Functions
Conservation of Plants and Animals
Crop Production & Management