Question

Why does the oxygen in the atmosphere does not exhaust?

• A. There is enough oxygen for all the organisms.
• B. Balance of oxygen and carbon dioxide by plants and animals.
• C. Not all organisms consume oxygen.
• D. Carbon dioxide released by living organisms reacts with air to produce oxygen.

Answer 1

The correct option is B Balance of oxygen and carbon dioxide by plants and animals.

$\bullet$ Plants, during the process of photosynthesis, consume carbon dioxide present in the air and produce oxygen along with their food.

$\bullet$ Plants also take in oxygen during respiration but the amount of oxygen produced during photosynthesis is more than what they take in.

$\bullet$ So, plants give out oxygen to the atmosphere which is consumed by animals. Animals release carbon dioxide. So, there is a balance of oxygen and carbon dioxide in the atmosphere maintained by plants and animals.