Excited electrons leave the Photosystem I reaction-center chlorophyll and are taken up by an electron acceptor, which passes them down an electron transport system before they return to Photosystem I. This pathway is called the ______.

glycolysis reactions

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Krebs cycle

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light-dependent reactions

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cyclic electron pathway

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Solution

The correct option is D
cyclic electron pathway

In cyclic photophosphorylation, electrons get excited and leave P700 in PSI. The electrons are passed on to an electron acceptor, and from there they move through an electron transport system back to P700.

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