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In the leaves of C4 plants, malic acid synthesis during CO2 fixation occurs in
Your answer:
Correct answer: (d)
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Explanation
Why (d) is correct
In C4 plants, CO2 is first fixed in the mesophyll cells: PEP forms oxaloacetic acid, which is converted to malic acid (a C4 acid). The malic acid then moves to the bundle sheath.
Why the other options are wrong
- (a) · your answer The bundle sheath receives the C4 acid and decarboxylates it; it does not make it.
- (b) · your answer Epidermal cells do not carry out C4 fixation.
- (c) · your answer Guard cells control stomata; they are not the site of malic acid synthesis in C4 fixation.
NCERT point: Mesophyll: fixation into C4 acids. Bundle sheath: release of CO2 and the Calvin cycle.
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