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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Which of the events listed below occur in the light reactions of photosynthesis?

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