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

Solution

## The correct option is B B and DZ 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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