During photosynthesis when PGA is changed into phosphoglyceraldehyde, which of the following reaction occur?

Oxidation

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Reduction

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Electrolysis

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Hydrolysis

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Solution

The correct option is B Reduction
3-phosphoglycerate (PGA, a carboxylic acid) is first phosphorylated into 1,3-bisphosphoglycerate by enzyme 3-phosphoglycerate kinase. This is followed by reduction of 1,3-bisphosphoglycerate catalyzed by glyceraldehyde 3-phosphate dehydrogenase enzyme into glyceraldehyde 3-phosphate (aldehyde). NADPH serves as electron donor here. Thus, the correct answer is B.

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