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  4. In C4 plants, CO2 combines with:

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Q. In $C_{4}$ plants, $CO_{2}$ combines with:

ManipalManipal 2001

Solution:

In $C_{4}$ plants, $CO_{2}$ combines in phosphoehole pyruvate (PEP) a $3C$ compound to form $4C$ compound oxaloacetic acid. The reaction is catalyzed by PEP carboxylase.