In plants,what is the function of $CAM$?

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

Which is the first stable product of the $C_4$ pathway?

The $C_4$ pathway (Hatch and Slack cycle) is found in which of the following plants?

Agranal chloroplasts are found in

$A$: In $C_4$ plants,chloroplasts of bundle sheath cells are granal.
$R$: $PS$ $II$ is mostly found in the appressed part of the granum.