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Question

Identify the correct statement(s) in relation to C4 photosynthesis.

A
Kranz anatomy is an essential feature for C4 plants.
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B
C4 plants have higher water use efficiency than C3 plants.
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C
Photorespiration can be minimized when C4 pathway is in operation.
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D
All of the above.
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Solution

The correct option is D All of the above.
Kranz leaf anatomy refers to the presence of two photosynthetic cell types namely bundle sheath (BS) cells and mesophyll (M) cells and is the characteristic of C4 plants. Spatial separation of carbon dioxide fixation and RUBISCO activity in mesophyll and bundle sheath cells of C4 plants respectively avoids photorespiration by concentrating CO2 in bundle sheath cells. These plants can carry out photosynthesis even keeping the stomata closed and exhibit high water use efficiency. OAA is converted into malate in mesophyll cells. Thus, the correct answer is option D.

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