The diagram below summarises the light-dependent reactions in photosynthesis.

What is occurring at X?

ADP + Pi →ATP

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NADP →NADPH + H+

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$2 H_{2} O$ → $O_{2}$ + 4H

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RuBP + $C O_{2}$ →2GP

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Solution

The correct option is A ADP + Pi →ATP

X: ADP + Pi $\to$ ATP

X represents the Electron Transport System (ETS). When electrons are released into the ETS, proton gradient is created which casues the phosphorylation of ADP to ATP.

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During what stage of photosynthesis are ATP and NADPH converted to ADP + Pi and NADP+?

NADPH and ATP are used in the ______ reactions of photosynthesis.

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