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Question

In C4-plants, Calvin cycle enzymes are absent in

A
Mesophyll chloroplasts
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B
Bundle sheath chloroplasts
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C
Guard cell chloroplasts
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D
Epidermal chloroplasts.
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Solution

The correct option is A Mesophyll chloroplasts
Most of the plants that are adapted to dry tropical regions have the C4 pathway. These plants are called C4 plants. Sugarcane, Maize, Sorghum, etc. are the examples of these plants. In these plants, double fixation of carbon dioxide occurs. In C4 plants, the Calvin cycle occurs in the bundle-sheath cells. Calvin cycle enzymes such as RubisCo is absent from the mesophyll cell of chloroplast of C4 plant. These enzymes are present in the bundle-sheath cells surrounding the vascular bundles, guard cells and epidermal cells of chloroplasts.

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