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Absorption of light by the reaction-centre chlorophyll of a photosystem results in

  • (a) direct evolution of O2 from the chlorophyll Your answer
  • (b) reduction of the chlorophyll Your answer
  • (c) absorption of CO2 by the chlorophyll Your answer
  • (d) oxidation of the chlorophyll Correct
Your answer: Correct answer: (d)
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Explanation

Why (d) is correct

When the reaction-centre chlorophyll absorbs light, its electron is excited and given to an acceptor. Losing an electron means the chlorophyll is oxidised.

Why the other options are wrong

  • (a) · your answer O2 comes from the splitting of water, not from chlorophyll.
  • (b) · your answer The chlorophyll loses an electron (oxidation); it is not reduced.
  • (c) · your answer Chlorophyll does not absorb CO2.
NCERT point: The oxidised P680 is reduced again by electrons from water.
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