MCQ Type

Q1

The humans do not depend on plants for which one of the following?

1. Carbon dioxide
2. Fuel
3. Oxygen
4. Food

Answer: 

Humans depend on plants for oxygen, fuel and food. But, humans do not require carbon dioxide.

The correct option is (A) - Carbon dioxide.

Q2

Which of the following is not a common component of air that we breathe in?

1. Nitrogen
2. Water vapours
3. Carbon dioxide
4. Oxygen

Answer:  

We do not breathe carbon dioxide because we exhale carbon dioxide.

The correct option is (C) - Carbon dioxide.

Q3

How can we detect the presence of air in a sponge?

1. Squeeze the sponge in water
2. Squeeze the sponge in air
3. Blow some air into the sponge
4. Pour some water on the sponge

Answer:                                 

The correct option is (A) - Squeeze the sponge in water.

Q5

Air is considered to be a/an 

1. Compound
2. Mixture
3. Element
4. Solvent

Answer:

Air is a mixture. Its constituents can be separated.

The correct option is (B) - Mixture.

Q6

Nitrogen is required by the plants to make

1. Fats
2. Proteins
3. Minerals
4. Carbohydrates

Answer:         

The correct option is (B) - Proteins.

:

Q7

The earthworms come out of the soil only during

1. Very hot weather
2. In spring
3. Very heavy rains
4. Very cold weather

Answer:                  

When the rain hits the ground it creates vibrations on the soil surface. This causes earthworms to come out of their burrows to the surface. They need a moist environment to survive.

The correct option is (C) - Very heavy rains.