S Gupta and N K Sharma Solutions for Chapter: Air Around Us, Exercise 1: EXERCISE FOR PRACTICE

Write two properties of air?

Name two major components of air.

Name a gas in air which is used by plants for making food during photosynthesis.

Which gas in the atmosphere is essential for respiration?

Name any one component of air which does support burning.

Name four objects whose movement is helped by oxygen

Note: The above question in the book was incorrect, hence modified as the following.

Name four objects whose movement is helped by air.

Explain the oxygen cycle.

Explain how the oxygen in the air is replaced.