In a condensed schematic representation of the dark reaction of photosynthesis given below, steps are indicated by alphabets. Select the option where the alphabets are correctly identified.

A =

C O_{2}

fixation, B = Reduction, C = Phosphorylation, D = Regeneration

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A = Regeneration, B =

C O_{2}

fixation, C = Reduction, D = Phosphorylation

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A =

C O_{2}

fixation, B = Phosphorylation, C = Reduction, D = Regeneration

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A =

C O_{2}

fixation, B = Phosphorylation, C = Regeneration, D = Reduction

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Solution

The correct option is C A = $C O_{2}$ fixation, B = Phosphorylation, C = Reduction, D = Regeneration
The diagram represents the Dark reaction of photosynthesis. The label A refers to fixation of CO $_{2}$ by the enzyme RuBisCo which reacts with the RUBP to form PGA. The label B refers to phosphorylation of PGA to give 1,3-di PGA. The label C refers to reduction of 1,3-di PGA to PGA. The label D refers to regeneration of RUBP which will help to continue the cycle to synthesize the glucose molecule.
Thus, the correct answer is option C.

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