Question

Photorespiration occurs in plants in which $C{O}_2$ is fixed by pathway of

• A. Calvin cycle
• B. Hatch Slack cycle
• C. Glycolysis
• D. Krebs cycle

Answer 1

The correct option is A Calvin cycle

Photorespiration is a biochemical pathway in which respiration occurs in the presence of light to reduce the consequences of a wasteful oxygenation reaction by the enzyme RuBisCO. It occurs when CO${}_2$ concentration is low inside the leaf. Thus, RuBisCO acts on oxygen instead of carbon dioxide and produces energy and carbon dioxide. The end product of photorespiration i.e., carbon dioxide is then utilised by the Calvin cycle to complete the photosynthesis.