🔬 Biology · Photosynthesis in Higher Plants · NEET

Photorespiration begins when the enzyme RuBisCO binds ___ instead of carbon dioxide:

A oxygen
B nitrogen
C water
D glucose

Correct answer: A. oxygen

Explanation: At high O₂/low CO₂, RuBisCO fixes oxygen, starting the wasteful photorespiration pathway.

Concept context

Light reactions, the Calvin cycle, C3/C4/CAM pathways, photorespiration, and factors affecting the rate of photosynthesis. One of the highest-yield NEET chapters.

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Photorespiration begins when the enzyme RuBisCO binds ___ instead of carbon dioxide:

Concept context

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