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

Answer 1

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 $NADP{H}_2$ 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.