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Question

In sugarcane plant 14CO2 is fixed in malic acid. in which the enzyme that fixes CO2 is:

A
Ribulose biphosphate carboxylase
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B
Phosphoenol pyruvic acid carboxylase
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C
Ribulose phosphate kinase
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D
Fructose phosphatase
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Solution

The correct option is B Phosphoenol pyruvic acid carboxylase
In C4 plants like sugarcane, CO2 is fixed on to phosphoenol pyruvic acid to form oxaloacetic acid. This reaction is catalyzed by the enzyme phosphoenol pyruvic acid carboxylase. The oxaloacetic acid is reduced to malic acid.

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