Question

During photosynthesis, oxygen is evolved from

• A. $H_{2}S$.
• B. $H_{2}O$.
• C. $C{O}_2$.
• D. $HC{O}_3$.

Answer 1

The correct option is B $H_{2}O$.

Photosynthesis is a redox reaction in which carbon dioxide is reduced to sugars and water is oxidised to release oxygen.

Photolysis refers to light dependent split of water molecule, which occurs during photosynthesis. The process of photolysis provides electrons for non cyclic electron flow during non cyclic photophosphorylation. Mineral ions required for the process of photolysis are manganese, calcium and chlorine.