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Which of the following absorbs light energy for photosynthesis?

  • (a) chlorophyll Correct
  • (b) RuBP Your answer
  • (c) O2 Your answer
  • (d) water molecule Your answer
Your answer: Correct answer: (a)
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Explanation

Why (a) is correct

Chlorophyll absorbs light energy and starts the light reaction. RuBP, oxygen and water do not absorb light for photosynthesis.

Why the other options are wrong

  • (b) · your answer RuBP is the CO2 acceptor in the Calvin cycle; it does not absorb light.
  • (c) · your answer Oxygen is a by-product of photosynthesis, not a light-absorbing pigment.
  • (d) · your answer Water is split to give electrons, but it does not absorb the light that drives photosynthesis.
NCERT point: Pigments (chlorophyll a, b and carotenoids) absorb light; chlorophyll a in the reaction centre uses it to drive electron transport.
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