$C_4$ plants show efficiency even in

What is the primary $CO_2$ acceptor in $C_4$ plants?

$RuBisCO$ in $C_4$ plants shows minimum oxygenase activity due to

Identify the correct characters of bundle sheath cells in $C_4$ plants from the following list:
$1.$ Thick walls.
$2.$ Intercellular spaces are present.
$3.$ Impervious to gaseous exchange.
$4.$ Contain grana.
$5.$ Contain thylakoids.

$A-$ In $C_4$ plants,carboxylation takes place in the chloroplasts of mesophyll cells and bundle sheath cells.
$R -$ In $C_3$ plants,$CO_2$ fixation occurs in mesophyll cells and bundle sheath cells.

$I.$ They have special leaf anatomy. $II.$ They tolerate high temperature.
$III.$ Lack photorespiration. $IV.$ Greater productivity of biomass.
These are the probable characters of: