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Question

Which one does not differ between a C3 and a C4 plant?
(I) Initial CO2 acceptor.
(II) Extent of photorespiration.
(III) Enzyme catalyzing reaction that fixes CO2.
(IV) Presence of Calvin cycle.
(V) Leaf anatomy.

A
I and V
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B
IV
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C
II and III
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D
II
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Solution

The correct option is B IV
The initial Co2 receptor is RuBP for c3 plants whereas phosphoenolpyruvate for C4 plants. Photorespiration losses are high in C3 whereas low in C4. Calvin cycle is a dark reaction which occurs in both C3 and C4 plants. C4 plants have specialized karnz anatomy of leaves. Thus, the correct answer is option B.

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