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Question

Read the following four statements, A, B, C and D and select the right option having both correct statements.
Statement :
(A) Z scheme of light reaction takes place in presence of PS-I only.
(B) Only PS-I is functional in cyclic photophosphorylaiton.
(C) Cyclic photophosphorylation results into synthesis of ATP and NADPH$$_2$$.
(D) Stroma lamellae lack PS-II as well as NADP.


A
C and D
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B
B and D
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C
A and B
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D
B and C
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Solution

The correct option is B B and D
Z scheme of light reaction is noncyclic flow of an electron from PSII through quinone, cyt $$b_6$$ f complex and plastocyanin to NADPH via PSI;it includes both PSI and PSII. In cyclic photophosphorylation, electrons are passed from P700 of PS-I via electron transfer chain to back to P700 with the formation of ATP.  It does not include PS II. Electrons are not passed to NADP reductase; no $$NADPH_2$$ is formed. Stroma lamellae lack PS II as well as NADP reductase enzyme while grana lamellae have both PS I and PS II. Thus, the correct answer is option B.

Biology

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