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C4 plants are more efficient in photosynthesis than C3 plants due to:

1. Higher leaf area
2. Presence of larger number of chloroplasts in the leaf cells
3. Presence of thin cuticle
4. Lower rate of photorespiration

Correct answer: Lower rate of photorespiration

Solution

C4 plants concentrate CO2 around RuBisCO, which suppresses photorespiration. With less photorespiration, more carbon is fixed into sugars, making photosynthesis more efficient than in C3 plants.

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