Cyclic photophosphorylation also occurs when only light of wavelengths beyond 680nm are available for excitation. When only PS I is functional, the electron is circulated within the photosystem I, and the phosphorylation occur due to the cyclic flow of electrons. A possible location where this could be happening is in the stroma lamellae. While the membrane or lamellae of the grana have both PS I and PS II the stroma lamellae membranes lack PS II as well as NADP reductase enzyme. The excited electron does not pass on to NADP+ but is cycled back to the PS I complex through the electron transport chain. The cyclic flow, hence, results only in the synthesis of ATP, but not of NADPH+H+.
Which of the following statements is incorrect?
NEET UG 2021 — Botany Photosynthesis in Higher Plants
2021mcqmedium
Which of the following statements is incorrect?
Official previous-year question
Held on 30 Apr 2021 · Verified 9 Jul 2026.
Options
- A
Both ATP and NADPH+H+ are synthesized during non-cyclic photophosphorylation.
- B
Stroma lamellae have PS I only and lack NADP reductase.
- C
Grana lamellae have both PS I and PS II.
- D
Cyclic photophosphorylation involves both PS I and PS II.
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NEET UG Photosynthesis in Higher Plants in other years
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