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Which of the following act as electron carriers in both photosynthesis and respiration?

  • (a) ferredoxins Your answer
  • (b) cryptochromes Your answer
  • (c) phytochromes Your answer
  • (d) cytochromes Correct
Your answer: Correct answer: (d)
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Explanation

Why (d) is correct

Cytochromes are iron-containing (haem) proteins that carry electrons in both chloroplasts (cytochrome b6f complex) and mitochondria (the respiratory chain).

Why the other options are wrong

  • (a) · your answer Ferredoxin carries electrons in photosynthesis (after PS I), not in mitochondrial respiration.
  • (b) · your answer Cryptochromes are blue-light receptors, not electron carriers in these processes.
  • (c) · your answer Phytochrome is a red/far-red light receptor, not an electron carrier.
NCERT point: Both photosynthesis and respiration use electron transport chains and make ATP by chemiosmosis.
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