P680+ is said to be the strongest biological oxidizing agent. given its function, why is this necessary? p680+ is said to be the strongest biological oxidizing agent. given its function, why is this necessary? it obtains electrons from the oxygen atom in a water molecule, so it must have a stronger attraction for electrons than oxygen has. it transfers its electrons to reduce nadp+ to nadph. it is the molecule that transfers electrons to plastoquinone (pq) of the electron transfer system. it is the receptor for the most excited electron in either photosystem of photosynthesis. it obtains carbon from a sugar molecule, so it must have a stronger attraction for electrons than either oxygen or hydrogen.

The correct answer is: It obtains electrons from the oxygen atom in a water molecule, so it must have a stronger attraction for electrons than oxygen has .

Light dependent reactions are part of the photosynthesis and they occur in the thylakoid membranes of chloroplasts. During this step of photosynthesis, molecule ATP and the reduced electron carrier NADPH are produced so that can be used for the further reactions. The main role in light dependent reaction is the role of photosystems (complexes of proteins and light-absorbing molecules-pigments):  

Photosystem I (PSI)- pair of chlorophyll P700

Photosystem II (PSII) - pair of chlorophyll P680

When light is absorbed by pigments in PSII, energy is transferred from pigment to pigment. As a result of this energy transfer, electron is boosted to a high energy level. That high-energy electron is then passed to an acceptor molecule (acceptor molecule becomes reduced) and replaced with an electron from water.  

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