Which gas is released as a byproduct of the light reactions?

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Multiple Choice

Which gas is released as a byproduct of the light reactions?

Explanation:
Light-dependent reactions occur in the thylakoid membranes and rely on splitting water to replace chlorophyll’s lost electrons. This water-splitting process releases oxygen gas as a byproduct, while the electrons and protons are used to drive the production of ATP and NADPH for the next stage of photosynthesis. Carbon dioxide isn’t produced in these reactions—it’s used later in the Calvin cycle. Nitrogen and methane aren’t part of this pathway. So the gas released during the light reactions is oxygen.

Light-dependent reactions occur in the thylakoid membranes and rely on splitting water to replace chlorophyll’s lost electrons. This water-splitting process releases oxygen gas as a byproduct, while the electrons and protons are used to drive the production of ATP and NADPH for the next stage of photosynthesis. Carbon dioxide isn’t produced in these reactions—it’s used later in the Calvin cycle. Nitrogen and methane aren’t part of this pathway. So the gas released during the light reactions is oxygen.

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