Explain the effect of low oxygen tension on C3 and C4 plants.

Explain the effect of low oxygen tension on C3 and C₄ plants.

(i) Low oxygen tensions stimulate photosynthesis in C₃ plants

Explanation

There is reduced competition between oxygen and carbon dioxide for the active site of ribulose -1, 5-biphosphate (RUBP) carboxylase enzyme.

(ii) Low oxygen tensions have no effect on the rate of photosynthesis in C₄ plants.

Explanation

The active site of phosphoenol pyruvate (PEP) decarboxylases enzyme does not accept oxygen.

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