Kranz anatomy is found in which of the following?

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

How many additional $ATP$ molecules are required for the synthesis of one molecule of hexose sugar in $C_4$ plants compared to $C_3$ plants?

As compared to a ${C_3}$ plant,how many additional molecules of $ATP$ are needed for the net production of one molecule of hexose sugar by ${C_4}$ plants?

The following figure represents the Hatch and Slack pathway. Identify $P, Q, R$ and $S$.

In what kind of plants do you come across 'Kranz' anatomy? To which conditions are those plants better adapted? How are these plants better adapted than the plants,which lack this anatomy?