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RuBisCO is an enzyme that acts both as a carboxylase and oxygenase. Why do you think RuBisCO carries out more carboxylation in C_4 plants?

4.  RuBisCO  is an enzyme that acts both as a carboxylase and oxygenase. Why do you think RuBisCO carries out more carboxylation in C_{4}            plants?

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S Sonika

RuBisCO functions as oxygenase only when there is a higher concentration of oxygen and a lower concentration of carbon dioxide. Both these conditions are not found in bundle sheath cells of C4 plants. These do not have a photolytic evolution of oxygen. They receive a regular supply of carbon dioxide even when the stomata are closed. Therefore, RuBisCO of C4 plants functions only as a carboxylase and not as oxygenase. 

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