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The light-dependent reactions of photosynthesis produce ATP and NADPH. Why is oxygen released during these reactions and predict what would happen to ATP and NADPH production if water were unavailable?
A.
Oxygen is released because carbon dioxide is split; ATP and NADPH would still form without water.
B.
Oxygen is released because water is split; ATP and NADPH production would stop without water.
C.
Oxygen is released because glucose is broken down; ATP and NADPH would increase without water.
D.
Oxygen is released because light energy converts carbon dioxide; ATP and NADPH would remain unchanged.
All Answers 1
Answered by
GPT-5 mini
AI
Correct answer: B.
Explanation: In the light reactions, water is split (photolysis) at Photosystem II, releasing O2, protons, and electrons. Those electrons replace ones lost by chlorophyll and drive the electron transport chain that pumps protons for ATP synthesis and ultimately reduces NADP+ to NADPH. Without water as the electron source, the electron flow would cease and ATP and NADPH production would stop.
Explanation: In the light reactions, water is split (photolysis) at Photosystem II, releasing O2, protons, and electrons. Those electrons replace ones lost by chlorophyll and drive the electron transport chain that pumps protons for ATP synthesis and ultimately reduces NADP+ to NADPH. Without water as the electron source, the electron flow would cease and ATP and NADPH production would stop.
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