Concept:Cyclic photophosphorylation is the light-driven process in which the electron removed from chlorophyll ultimately returns to the same chlorophyll molecule.
Explanation:In photosynthesis, chlorophyll absorbs light energy and becomes excited.
This energy boosts an electron to a higher energy level, causing it to be emitted from the chlorophyll molecule.
In cyclic photophosphorylation, this electron is accepted by an electron acceptor and then passed along an electron transport chain.
As the electron moves downhill through the chain, the released energy drives the synthesis of ATP.
The electron is finally cycled back to the chlorophyll molecule (
P700) from which it was lost.
Thus, the electron returns to chlorophyll unchanged, which exactly matches the description in the question.
Non-cyclic photophosphorylation cannot apply because, in that process, the electron is ultimately transferred to NADP
+ and does not return to chlorophyll.
Hence, the correct term is cyclic photophosphorylation.
Answer:D. cyclic photophosphorylation