Check sibling questions


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

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



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

The correct option is (A) - Carbon dioxide.



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



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

The correct option is (C) - Carbon dioxide.



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



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



Air is considered to be a/an 

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



Air is a mixture. Its constituents can be separated.

The correct option is (B) - Mixture.



Nitrogen is required by the plants to make

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



The correct option is (B) - Proteins.



The earthworms come out of the soil only during

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



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

CA Maninder Singh is a Chartered Accountant for the past 13 years and a teacher from the past 17 years. He teaches Science, Economics, Accounting and English at Teachoo