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.
It obtains electrons from the oxygen atom in a water molecule, so it must have a stronger attraction for electrons than oxygen has.
P680+ is considered as the strongest biological oxidizing agent because it dissociates water into Hydrogen and Oxygen atom so by oxidizing water P680 receives two electrons. The substance which acts as oxidizing agent is known as oxidant.
The oxidant is a substance which easily transfers atoms of oxygen or another substance so that it can gains or receives an electron so we can conclude that P680+ is considered as oxidizing agent.
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