NEET2026BiologyChapterActual
Which of the following statements correctly describes the distribution and function of photosystems in the chloroplast?
Options
- AGrana lamellae possess only Photosystem II, which is responsible for the synthesis of both ATP and NADPH.
- BStroma lamellae lack Photosystem II but contain NADP reductase, allowing them to perform cyclic photophosphory
- CCyclic photophosphorylation usually occurs when only light of wavelengths beyond 680 nm are available for exci
- DNon-cyclic photophosphorylation is restricted to stroma lamellae and requires the presence of both PS I and PS
Correct answer
C. Cyclic photophosphorylation usually occurs when only light of wavelengths beyond 680 nm are available for exci
Step-by-step solution
Grana lamellae have both PS I and PS II, whereas stroma lamellae lack PS II and NADP reductase enzyme. Stroma lamellae contain only PS I and perform cyclic photophosphorylation, which synthesizes ATP but not NADPH. Cyclic photophosphorylation occurs when only light of wavelengths beyond 680 nm is available for excitation, as PS II (which absorbs at 680 nm ) is not activated, leaving only PS I (which absorbs at 700 nm ) functional. Non-cyclic photophosphorylation occurs in grana lamellae where both PS I and PS II ar