NEET 2018 · BiologyPrevious Year Question
Which of the following is not a product of light reaction of photosynthesis?
Answer: (B) NADH. The light reaction (photochemical phase) generates ATP and NADPH, and water splitting releases O2; these are its products.
- A.NADPH
- B.NADH✓
- C.ATP
- D.Oxygen
Correct Answer
(B) NADH
Solution & Explanation
The light reaction (photochemical phase) generates ATP and NADPH, and water splitting releases O2; these are its products. NADH is not formed in photosynthesis at all — it is a reduced coenzyme produced during cellular respiration. Therefore NADH is not a product of the light reaction. NCERT: Class 11 Ch 11, p.138 [138:014-017]: "Light reactions or the ‘Photochemical’ phase include light absorption, water splitting, oxygen release, and the formation of high-energy chemical intermediates, ATP and NADPH."
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