During dark reaction the three carbon atoms of 3-PGA are derived from

R u B P

only

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C O_{2}

only

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R u B P + C O_{2}

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R u B P + C O_{2} + P E P

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Solution

The correct option is D $R u B P + C O_{2}$
Dark reaction initiates from the binding of carbon dioxide from RuBP in the presence of enzyme RuBisCo which gives 3 phosphoglyceric acid or 3-PGA molecules and the process is known as carboxylation.
So the correct option is ' $R u B P + C O_{2}$ '.

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