Question

In $C_4$ plants, synthesis of sugars occurs in

• A. Mesophyll cells
• B. Bundle sheath cells
• C. Spongy parenchyma cells
• D. Palisade parenchyma cells.

Answer 1

The correct option is B Bundle sheath cells

In $C_4$ plants, the Calvin cycle occurs for the synthesis of sugar. Calvin cycle enzymes such as RubisCo is absent from the mesophyll cell of chloroplast of $C_4$ plants. These enzymes are present in the bundle-sheath cells surrounding the vascular bundles, guard cells and epidermal cells of chloroplasts. So, the Calvin cycle occurs in the bundle-sheath cells. That’s why, in $C_4$ plants, synthesis of sugar occurs in bundle-sheath cells.