Question

In $C_4$ plants, decarboxylation takes place in _________.

• A. guard cells
• B. bundle sheath
• C. mesophyll cell
• D. hypodermis

Answer 1

The correct option is B bundle sheath

In $C_4$ plants, decarboxylation takes place in bundle sheath, whereas the initial $C{O}_2$ fixation takes place in mesophyll cells. The $C{O}_2$ that is fixed in the mesophyll cells through the $C_4$ pathway is released in the bundle sheath cells during the decarboxylation process. The $C{O}_2$ released in turn enters the $C_3$ cycle in the bundle sheath cells.