Q12 of 59 Page 74

Why is Rubisco enzyme the most abundant enzyme in the world?

Rubisco catalyses the first step during the Calvin cycle to transform carbon dioxide into sugar. In all photosynthetic organisms worldwide, this enzyme is present. From cyanobacteria to the floors of large trees; literally, Rubisco is present all over the place.

All carbon in the biosphere can be said to be derived from Rubisco carbon fixation. This is therefore the world's largest enzyme.


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9

Why is the Rubisco enzyme more appropriately called RUBP Carboxylase-Oxygenase and what important role does it play in photosynthesis?

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What special anatomical features are displayed by leaves of C4 plants? How do they provide advantage over the structure of C3 plants?

 11

Name the two important enzymes of C4 pathway, and explain their role in fixing CO2?

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Why photorespiration does not take place in C4 plants?