Question

Short /Long answer type question.
Trace the cyclic electron pathway, naming and explaining the main events that occur as electrons cycle.

Answer 1

Cyclic electron pathway is followed by the chloroplast of green plants which results in the production of ATP but not NADPH or O${}_2$.In the pathway only photosystem 1 is present. The events that occur during the cycle electron pathway are:-

• The electrons that were excited by P700 move along a chain of electron carriers.

• The electron never reaches NADP+.

• As the electrons reach ferredoxin, they are transferred to the cytochrome bf complex.

• Then when the electrons are transferred to plastocyanin, an ATP molecule is made from ADP and Pi.

• Then from plastocyanin, the electrons flow back to the P700+.