RuBisCo is an enzyme that acts both as a | Class 11 Biology Chapter Photosynthesis in Higher Plants, Photosynthesis in Higher Plants NCERT Solutions

Question: RuBisCo is an enzyme that acts both as a carboxylase and oxygenase. Why do you think RuBisCo carries out more carboxylation in C4plants?

Answer:

The enzyme RuBisCo is absent from the mesophyll cells of C4 plants. It is present in the bundle-sheath cells surrounding the vascular bundles. In C4 plants, the Calvin cycle occurs in the bundle-sheath cells. The primary CO2 acceptor in the mesophyll cells is phosphoenol pyruvate – a three-carbon compound. It is converted into the four-carbon compound oxaloacetic acid (OAA). OAA is further converted into malic acid. Malic acid is transported to the bundle-sheath cells, where it undergoes decarboxylation and CO2fixation occurs by the Calvin cycle. This prevents the enzyme RuBisCo from acting as an oxygenase.

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Comments

Adit Rana
2019-06-05 17:29:02

Thank for the answer...... Lots of thanks

GAURI GANDHI
2019-02-26 22:34:53

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Welcome to the NCERT Solutions for Class 11 Biology - Chapter . This page offers a step-by-step solution to the specific question from Excercise 1 , Question 4: RuBisCo is an enzyme that acts both as a carboxylase and oxygenase. Why do you think RuBisCo carries....

RuBisCo is an enzyme that acts both as a | Class 11 Biology Chapter Photosynthesis in Higher Plants, Photosynthesis in Higher Plants NCERT Solutions

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