C_4 plants are more efficient in photosynthesis than C_3 plants due to

NEET 2010 Biology question

C plants are more efficient in photosynthesis than C plants due to

(1)Presence of larger number of chloroplasts in the leaf cells
(2)Presence of thin cuticle
(3)Lower rate of photorespirationCorrect
(4)Higher leaf area

Answer: (3)

Solution

C4 plants have Kranz anatomy; PEP carboxylase fixes CO2 in mesophyll cells and the resulting C4 acid releases CO2 inside the bundle sheath cells, creating a high CO2 concentration around RuBisCO. This suppresses the oxygenase activity of RuBisCO, so photorespiration is negligible (or very low), and no

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Question ID VK-090571