Kranz anatomy can be seen in

In the case of the $C_4$ pathway:

In $C_4$ plants,carbon fixation occurs in the chloroplasts of .........

Agranal chloroplasts are found in

Compared to $C_3$ plants,how many additional $ATP$ molecules are required to produce one molecule of hexose in $C_4$ plants?

$A$: Tropical plants are more efficient in $CO_2$ utilization.
$R$: $C_3$ plants ensure that $RuBisCO$ functions as carboxylase,minimizing oxygenase activity.