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The C4 plants are photosynthetically more efficient than C3 plants because:

1. the CO2 compensation point is more
2. CO2 generated during photorespiration is trapped and recycled through PEP carboxylase
3. the CO2 efflux is not prevented
4. they have more chloroplasts

Correct answer: CO2 generated during photorespiration is trapped and recycled through PEP carboxylase

Solution

C4 plants are more efficient because they minimize photorespiratory loss by concentrating CO2 around Rubisco. The CO2 released is effectively trapped and recycled via PEP carboxylase, which boosts carbon fixation efficiency.

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