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.

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Maninder Singh's photo - Co-founder, Teachoo

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Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 14 years and a teacher from the past 18 years. He teaches Science, Economics, Accounting and English at Teachoo