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NEET 2010 Biology question

BiologyPhotosynthesis in Higher PlantsNEET 2010

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 PSI only (B) Only PSI is functional in cyclic photophosphorylation. (C) Cyclic photophosphorylation results into synthesis of ATP and NADPH (D) Stroma lamellae lack PSII as well as NADP. Options :

Answer: (2)

Solution

(A) False: the Z scheme (non-cyclic electron flow) needs both PSII and PSI working in series. (B) True: in cyclic photophosphorylation only PSI works; electrons released from PSI return to it through the cytochrome bf complex, so no PSII, no photolysis of water and no O release. (C)

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Question ID VK-090403