Q1
The humans do not depend on plants for which one of the following?
- Carbon dioxide
- Fuel
- Oxygen
- 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?
- Nitrogen
- Water vapours
- Carbon dioxide
- 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?
- Squeeze the sponge in water
- Squeeze the sponge in air
- Blow some air into the sponge
- 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
- Compound
- Mixture
- Element
- 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
- Fats
- Proteins
- Minerals
- Carbohydrates
Answer:
The correct option is (B) - Proteins.
:
Q7
The earthworms come out of the soil only during
- Very hot weather
- In spring
- Very heavy rains
- 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.
