Question

Which of the processes, respiration or photosynthesis, is the major source of Oxygen in the biosphere?

Answer 1

Respiration:

• The process in which food combines with Oxygen to form Carbon dioxide, Water vapour, and energy is called respiration.
• $\mathrm{Food}+\mathrm{Oxygen}\to \mathrm{Carbon}\mathrm{dioxide}+\mathrm{Water}\mathrm{vapor}+\mathrm{Energy}$

Photosynthesis:

• The process in which green plants use Carbon dioxide, Water, Chlorophyll, and Sunlight to form food and Oxygen is called photosynthesis.
• $\mathrm{Carbon}\mathrm{dioxide}+\mathrm{Water}\underset{\mathrm{Sunlight}}{\overset{\mathrm{Chlorophyll}}{\rightleftharpoons }}\mathrm{Food}+\mathrm{Oxygen}$

Therefore, Photosynthesis is the major source of oxygen in the biosphere.