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Which statement correctly describes the production of NADPH during photosynthesis?

1. NADPH is formed by photosystem I during the process of non-cyclic photophosphorylation.
2. P700 contains chlorophyll a and chlorophyll b and is named based on its peak absorption wavelength.
3. Cyclic photophosphorylation generates ATP consistently in sunlight, but ATP is unstable and not easily stored. Non-cyclic photophosphorylation creates both ATP and NADPH, requiring water.
4. The Hatch-Slack pathway is a cyclic CO2 fixation process where phosphoenol pyruvate (PEP), a 3-carbon molecule, acts as the primary CO2 acceptor in mesophyll cells.

Correct answer: Cyclic photophosphorylation generates ATP consistently in sunlight, but ATP is unstable and not easily stored. Non-cyclic photophosphorylation creates both ATP and NADPH, requiring water.

Solution

Non-cyclic photophosphorylation uses both photosystems, splits water, and passes electrons to NADP+ to form NADPH. Cyclic photophosphorylation returns electrons to the electron transport chain, so it makes ATP only and not NADPH.

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