During the light reactions, a water molecule is split, supplying the missing electrons in PSI and PSII. (True or False)

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Question restatement: The prompt asks whether, during the light reactions of photosynthesis, a water molecule is split to supply the missing electrons to PSI and PSII.

Option 1: True. The claim that water splitting supplies missing electrons to both PSI and PSII is a common point of confusion. In reality, the special photolysis of water at PSII releases electrons that primarily replenish the electrons lost by PSII when it transfers them to the plastoquinone pool. These electrons then travel through the electron transport chain to PSI, but the immediate source of electrons for PSII is water split at PSII itself, not PSI. If one interprets the statement as suggesting PSI receives electrons directly from water splitting, that is inaccurate because PSI relies on electrons arriving from the PSII branch of the chain, not from water splitting at PSII. This makes the statement misleading and generally incorrect.

Option 2: False. This option correctly reflects the sequence: water is split at PSII to replace electrons lost by PSII; over the course of the transport chain, electrons eventually reach PSI via the plastocyanin/ferredoxin pathway, and NADP+ is reduced downstream. The role of water splitting is localized to PSII and does not directly supply electrons to PSI. The wording in the statement incorrectly implies a direct and simultaneous provision of electrons to both PSII and PSI from water splitting, which is not how the Z-scheme operates. Recognizing this helps avoid the misconception that PSI gets electrons directly from water splitting, rather than from the downstream flow of electrons through the chain.

In summary, the statement in option 1 overgeneralizes the source and direct destinations of electrons, while option 2 accurately describes the distinct roles and order of events in the light-dependent reactions. The nuance hinges on identifying that water splitting primarily replenishes PSII and that PSI receives electrons via the electron transport chain rather than directly from water.

During the light reactions, a water molecule is split, supplying the missing electrons in PSI and PSII. (True or False)

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During the light reactions, a water molecule is split, supplying the missing electrons in PSI and PSII. (True or False)

View Explanation

Log in for full answers

Similar Questions

Which of the following are products of the light reactions of photosynthesis that are utilized in the Calvin cycle?

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What are the 2 main products of the light reactions? (Choose ONE correct answer)

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