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Which of the following pigments acts as a reaction centre during photosynthesis?

  • (a) cytochrome Your answer
  • (b) phytochrome Your answer
  • (c) P700 Correct
  • (d) carotene Your answer
Your answer: Correct answer: (c)
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Explanation

Why (c) is correct

P700 is the reaction-centre chlorophyll a of PS I. The reaction centre passes energized electrons to the electron acceptor; other pigments only harvest light.

Why the other options are wrong

  • (a) · your answer Cytochromes carry electrons in the electron transport chain; they are not reaction centres.
  • (b) · your answer Phytochrome is a light-detecting pigment for growth responses, not a photosynthetic reaction centre.
  • (d) · your answer Carotene is an accessory pigment; it passes energy to chlorophyll a but is not a reaction centre.
NCERT point: Reaction centres: P700 (PS I) and P680 (PS II); both are chlorophyll a.
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