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

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

KCETKCET 2014Photosynthesis in Higher Plants

Solution:

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
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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 $CO_{2}$