First slide

Factors affecting Photosynthesis

Question

Statement A: Rubisco of bundle sheath cells of C₄ plants shows more carboxylase activity than the mesophyll cells of C₃ plants.
Statement B: High CO₂ concentration is maintained in bundle sheath cells of C₄ plants than in mesophyll cells of the same plant.

Easy

A

Both statements A and B are incorrect.
B

Statement A is correct and B is incorrect.
C

Both statements A and B are correct.
D

Statement A is incorrect and B is correct.

Solution

The CO₂ involved in carboxylation of PEP in mesophyll cells of C₄ plants is pumped into bundle sheath cells to maintain high CO₂ concentration to avoid or decrease the oxygenase activity of Rubisco. In C₃ plants, the CO₂ concentration of its green cells is far lower. Hence these plants show relatively more photorespiratory loss of carbon than C₄ plants.

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