The correct sequence of electron carriers that receive the electrons from the primary electron acceptor of PS-II and pass them to PS-I:

Correct answer: D. PQ → Cytochrome complex → PC

  • A. PS → Cytochrome complex → PQ
  • B. PQ → PC → Cytochrome complex
  • C. Cytochrome complex → PQ → PC
  • D. PQ → Cytochrome complex → PC

Explanation

The correct sequence in the photosynthetic electron transport chain, particularly in non-cyclic photophosphorylation, starts with the primary electron acceptor of PS-II passing electrons to plastoquinone (PQ). From PQ, electrons move to the cytochrome complex and then to plastocyanin (PC) before reaching PS-I. Option D accurately represents this pathway. Other options are incorrect due to misordering: Option A incorrectly starts with the cytochrome complex instead of PQ; Option B misplaces PC before the cytochrome complex; and Option C inverts the initial steps by starting with the cytochrome complex.

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