In $C_{4}$ pathway, PEP carboxylase gains $C O_{2}$ from

Pyruvic acid

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PEPA

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OAA

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Malic acid

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Solution

The correct option is C Malic acid
A) Pyruvic acid does not release ${C O}_{2}$ .
B) Phosphoenol pyruvic acid (PEPA) is converted to OAA in the presence of PEP case.
C) OAA is converted to malate which releases ${C O}_{2}$ .
D) PEP carboxylase binds to ${C O}_{2}$ to make oxaloacetic acid (OAA). OAA then makes malate. Malate enters bundle sheath cells and releases the ${C O}_{2}$

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