Single Choice

Which of the following is incorrect about the light reactions of photosynthesis?

A$$P_{680}$$ and $$P_{700}$$ are the reaction centres of PS-I and PS-II respectively
Correct Answer
BLight energy provides energy for the photolysis of water through excitation of the reaction centre of PS-II
CNADPH is not produced in cyclic electrons transport in light reactions
DReactions of the two photosystems are needed for the reduction of NADP

Solution

Photosystem II have absorption peak of approximately 680 nanometers and the reaction centre pigment is called P$$_{680}$$ while that of PSI have absorption peak of approximately 700 nanometers and is called as P$$_{700}$$. Sunlight provides energy for the splitting of water during light reaction. Z scheme of light reaction is a non-cyclic flow of electron and involves both PS I and PSII to produce NADPH while cyclic photophosphorylation does not pass electrons to NADP and NADPH is produced.
So, the correct option is A.

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