Question

Photosynthetic yield is reduced due to

• A. Plasmolysis of cell
• B. Glycolysis of glucose
• C. Photolysis of water
• D. Photorespiration

Answer 1

The correct option is D Photorespiration

During high temperature and increase in the concentration of the oxygen, the photosynthetic yield declines due to the increase in the affinity of the enzyme ribulose bisphosphate carboxylase oxygenase (RuBPCO) for the oxygen and decrease in the affinity for the carbon dioxide. Due to this change in affinity, it binds with oxygen instead of carbon dioxide and then the process of photorespiration begins rather than the dark reaction. It is a wasteful process in which plants have to spend ATPs to regenerate the enzyme and the carbon.

Hence, the correct answer is 'Photorespiration'.