The primary ${\mathrm{CO}}_2$ acceptor in ${\mathrm{C}}_4$ plants is:

In ${\mathrm{C}}_4$ pathway, the 4-carbon compound transported to bundle sheath cells most commonly is:

Identify the incorrectly matched pair:

Identify the incorrect statement regarding the comparison of ${\mathrm{C}}_4$ plants to the ${\mathrm{C}}_3$ plants: