set 4 MCQ Questions & Answers Detailed Explanation

Question : 1

How do most insects respire?

a) Through gills

b) By lungs

c) Through skin

d) By tracheal system

Question : 2

Which of the following is a stem?

a) Ginger

b) Carrot

c) Turnip

d) Sweet potato

Question : 3

Assertion (A):
Some bacteria can synthesize their own food.
Reason (R):
These bacteria have green matter called chloroplasts.
Code

a) Both (A) and (R) are true, but (R) is not the correct explanation of (A)

b) (A) is true, but (R) is false

c) Both (A) and (R) are true and (R) is the correct explanation of (A)

d) (A) is false, but (R) is true

Question : 4

Biologists have so far known, found and identified a large number of species in the plant and animal kingdom. In terms of numbers, the largest found and identified so far is from among the

a) Plants

b) Insects

c) Fungi

d) Bacteria

Question : 5

Which one of the following is a true fish?

a) Jellyfish

b) Dogfish

c) Starfish

d) Seahorse

Question : 6

Fishes survive under the frozen lake, because

a) Fishes are in hibernation under it

b) Water does not freeze near bottom

c) Fishes have hot blood

d) Ice is the conductor of heat