Question

Oxygen is released in photosynthesis by

• A. photophosphorylation
• B. photolysis of water
• C. photorespiration
• D. photons

Answer 1

The correct option is B photolysis of water

This part of photosynthesis occurs in the granum of a chloroplast where light is absorbed by chlorophyll; a type of photosynthetic pigment that converts the light to chemical energy. This reacts with water (H2O) and splits the oxygen and hydrogen molecules apart. In the first stage of photosynthesis light energy is absorbed by chlorophyll in plant cells. This light energy is then used to produce ATP and to split water into hydrogen and oxygen. The splitting of water is referred to as photolysis.

So, the correct option is, 'photolysis of water'.