Question

Choose the reasons to justify that plants are called the lungs of the Earth.

• A. The increase in plant cover on the Earth increases air pollution
• B. They absorb oxygen from the atmosphere and release carbon dioxide
• C. They absorb carbon dioxide from the atmosphere and release oxygen
• D. The decrease in plant cover on the Earth decreases air pollution

Answer 1

The correct option is C

They absorb carbon dioxide from the atmosphere and release oxygen

The service provided by plants for the sustenance of the biological world is unique. Plants are the cheapest and effective natural mechanism for the purification of air. Plants offer great service to the biological world by absorbing carbon dioxide from the atmosphere and releasing oxygen. It is estimated that plants give out approximately 118 kilograms of oxygen when they use one tonne carbon dioxide. As the plant cover on the earth decreases, this recycling mechanism stops and air pollution becomes severe.