Question

Statement A : Photorespiration decreases photosynthetic output Statement B : In photorespiratory pathway, neither ATP nor NADPH is produced.

• A. Both the statements A and B are correct.
• B. Both the statements A and B are wrong.
• C. Statement A is correct and statement B is wrong.
• D. Statement B is correct and statement A is wrong.

Answer 1

Answer: (A)

Both the statements A and B are correct.

Answer 2

Photorespiration is a cyclic process in which RuBisCO acts as an oxygenase enzyme instead of carboxylase enzyme. Active site of this enzyme is same for both of these activities. In $C_{3}$ plants, some $O_{2}$ always bind to RuBisCO

Photorespiration does not produce energy or reducing power. Rather, it consumes energy. Further, it undoes the work of photosynthesis. There is $25\%$ loss of fixed $CO_{2}$