Question

$C{O}_2$ is accepted by RUBP in $C_4$ plants in

• A. Mesophyll cells
• B. Bundle sheath cells
• C. Stomatal guard cells
• D. Epidermal cells

Answer 1

The correct option is B Bundle sheath cells

The thick walled bundle sheath cells present around vascular bundles in the shape of a ring in $C_4$ plants have chloroplast. The bundle sheath cells have agranal chloroplast and fix carbon dioxide with the help of RuBisCO enzyme. The thin walled mesophyll cells carry out initial carbon dioxide fixation with the help of PEP carboxylase enzyme. This special arrangement of cells and presence of dimorphic chloroplasts helps in minimizing photorespiration in $C_4$ plants.