Question

Name the major source of atmospheric oxygen.

Answer 1

Photosynthesis: The process by which green plants and some other organisms use sunlight to synthesize nutrients from Carbon dioxide $\left({\mathrm{CO}}_2\right)$and water$\left({\mathrm{H}}_2\mathrm{O}\right)$.

Photosynthesis in plants generally involves the green pigment chlorophyll and generates Oxygen$\left({\mathrm{O}}_2\right)$ as a by-product.

Therefore, we can say that photosynthesis is the source of Oxygen that is formed by green plants and blue green algae