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Assertion (A): Dark acidification of the cytoplasm occurs in CAM plants.
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Assertion (A): Dark acidification of the cytoplasm occurs in CAM plants.
Reason (R): Organic acids are decarboxylated during the night.
Your answer:
Correct answer: (c)
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Explanation
Why (c) is correct
A is true: at night CAM plants fix CO2 into organic acids (mainly malic acid), so the cell sap becomes acidic. R is false: the acids are decarboxylated during the day, not at night.
Why the other options are wrong
- (a) · your answer R is false, so it cannot explain A.
- (b) · your answer R is false: decarboxylation happens in the daytime.
- (d) · your answer A is true: acid builds up at night in CAM plants.
NCERT point: The dark reactions use ATP and NADPH to fix CO2 into sugar in the stroma.
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