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Read the following four statements and select the option having both correct statements.
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Read the following four statements and select the option having both correct statements.
(i) The Z scheme of the light reaction takes place in the presence of PS I only.
(ii) Only PS I is functional in cyclic photophosphorylation.
(iii) Cyclic photophosphorylation results in the synthesis of ATP and NADPH2.
(iv) Stroma lamellae lack PS II as well as NADP reductase.
Your answer:
Correct answer: (a)
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Explanation
Why (a) is correct
In cyclic photophosphorylation only PS I works, so (ii) is correct. The stroma lamellae have PS I but lack PS II and NADP reductase, so (iv) is correct. The Z scheme needs both photosystems, and cyclic flow makes ATP only, so (i) and (iii) are wrong.
Why the other options are wrong
- (b) · your answer (i) is wrong: the Z scheme (non-cyclic flow) needs both PS II and PS I.
- (c) · your answer (iii) is wrong: cyclic photophosphorylation makes ATP only, not NADPH.
- (d) · your answer (iii) is wrong: no NADPH is formed in cyclic flow.
NCERT point: Cyclic photophosphorylation occurs in the stroma lamellae, which have PS I but no PS II or NADP reductase.
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