During the dark reactions of photosynthesis

Water splits.

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C O_{2}

is reduced to organic compounds.

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Chlorophyll is activated.

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Six carbon sugar is broken into three carbon sugar.

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Solution

The correct option is C $C O_{2}$ is reduced to organic compounds.
Photosynthesis occurs in two phases-light reaction and dark reaction. During light reaction water undergoes photolysis releasing oxygen and reduced $N A D P H_{2}$ and ATP molecules are synthesized. During the dark reaction, $N A D P H_{2}$ and ATP are used to reduce carbon dioxide into sugars.

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