Read the following statements regarding photosystems: (A) In PS I, the reaction centre chlorophyll a has an absorption peak at 700 nm. (B) The reaction centre of PS II is called P680. (C) Stroma lamellae possess both PS I and PS II. (D) PS II is involved in cyclic photophosphorylation. How many of the above statements are correct?

Step-by-step solution

Statement (A) is correct as the reaction centre of Photosystem I (PS I) is P700, having an absorption peak at 700 nm. Statement (B) is correct as the reaction centre of Photosystem II (PS II) has an absorption maximum at 680 nm and is called P680. Statement (C) is incorrect because stroma lamellae membranes lack PS II and NADP reductase enzyme; they possess only PS I. Statement (D) is incorrect because PS II is involved only in non-cyclic photophosphorylation, whereas cyclic photophosphorylation involves only PS I.