Radioactive $C^{14}$ is given to $C 0_{2}$ and released to atmosphere. This $C 0_{2}$ is taken by ribulose diphosphate in a $C_{3}$ plant. First radioactive $C^{14}$ is seen in which compound?

PGAL

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PEP

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RMP

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PGA

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Solution

The correct option is D PGA
$C^{14}$ an isotope of carbon, has been used to draw the path of $C 0_{2}$ fixation in Kelvin cycle.This labelled $C^{14}$ becomes incorporated with $^{14} C O_{2}$ which is accepted by RuBP and a 3-C compound phosphoglyceric acid (3 PGA) is formed, PGA is the first stable compound.

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