What happens when light energy excites electrons in photosystem II?

The process that occurs is photolysis. Photolysis splits apart water molecules to make electrons and hydrogen ions. The hydrogen ion is used to reduce NaDP (later on). Oxygen is produced as a byproduct.

This is the equation 2H₂O⇒4e⁻ + 4H⁺ The electrons here replace the lost ones in the chlorophyll.

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ArnimZola ArnimZola · Answer 2 · 2019-07-08T17:46:37+02:00

Answer:

The electrons are fed into the electron transport chain to drive ATP synthesis.

Explanation:

Trapping of Sunlight makes the reaction center of photosystem II (PSII) to pass the electrons to plastoquinone. The reduced plastoquinone then passes the electrons to the cytochrome b6f complex. From here, electrons are carried to the plastocyanin and then to reaction center of PS I.

Hence, the release of the electrons from PSII is followed by channelizing the electrons to the electron transport chain (PSII->plastoquinone->cyt b6f complex->plastocyanin). Here, the electron transfer through cytochrome b6f complex generates proton motive force which in turn drives the ATP synthesis.