PHOTOSYNTHESIS
LIGHT DEPENDENT REACTIONS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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H2O
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Sunlight
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Electrons jumping off the ETC from Photosystem II
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ADP returning from the Calvin Cycle SHOW ANSWER
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Detailed explanation-1: -During the light reactions of photosynthesis, photosystem II reaction centre P680 absorbs light to boost its electrons and attains oxidized state. To reduce the oxidized chlorophyll molecules or to regain the lost electrons, the source of electrons is water in green plants and cyanobacteria.
Detailed explanation-2: -Once an electron is lost, each photosystem is replenished by electrons from a different source. The PSII reaction center gets electrons from water, while the PSI reaction center is replenished by electrons that flow down an electron transport chain from PSII.
Detailed explanation-3: -Photosystem I (PS I) and photosystem II (PS II) are two multi-subunit membrane-protein complexes involved in oxygenic photosynthesis. Chlorophyll is the pigment involved in capturing light energy.
Detailed explanation-4: -The chlorophyll molecule regains the lost electron from a water molecule through a process called photolysis, which releases dioxygen (O2) molecule.