Which out of the following statements is incorrect?
Answer: (D) Cyclic photophosphorylation involves both PS I and PS II. Cyclic photophosphorylation is driven by PS I alone (P700) in the stroma lamellae, which lack PS II and NADP reductase, so it produces only ATP.
- A.Both ATP and NADPH + H+ are synthesised during non-cyclic photophosphorylation.
- B.Stroma lamellae lack PS II and NADP reductase
- C.Grana lamellae have both PS I and PS II
- D.Cyclic photophosphorylation involves both PS I and PS II✓
Correct Answer
(D) Cyclic photophosphorylation involves both PS I and PS II
Solution & Explanation
Cyclic photophosphorylation is driven by PS I alone (P700) in the stroma lamellae, which lack PS II and NADP reductase, so it produces only ATP. The statement that cyclic photophosphorylation involves both PS I and PS II is therefore incorrect. The other statements (non-cyclic makes ATP and NADPH; stroma lamellae lack PS II and NADP reductase; grana lamellae have both photosystems) are all correct. NCERT: Class 11 Ch 11, p.140 [140:015]: "When only PS I is functional, the electron is"