Question

Photorespiration is a wasteful process where there is no synthesis of ATP energy. RuBisCO is present in mesophyll cells of C plants hence they show more productivity.

• A. If both assertion and reason are true and reason is the correct explanation of assertion
• B. If both assertion and reason are true but reason is not the correct explanation of assertion
• C. If assertion is true but reason is false
• D. If both assertion and reason are false

Answer 1

Answer: (C)

If assertion is true but reason is false

Answer 2

Photorespiration does not produce energy or reducing power. Rather it consumes energy. In C plants, photorespiration, does not occur. Here, RuBisCO is located only in bundle sheath cells where photosynthetic release of oxygen does not occur. Bundle sheath cells have a high intracellular concentration of CO due to flow of C acids and their decarboxylation to release CO. Therefore, RuBisCO functions purely as carboxylase in C plants. They show high productivity and hence higher yield.