Which one is a $C_4$ plant?

The $C_{4}$ plants are twice as efficient as $C_{3}$ plants in terms of fixing $CO_{2}$ but lose only $........$ as much water as $C_{3}$ plants for the same amount of $CO_{2}$ fixed.

What is the role of large bundle sheath cells found around the vascular bundles in $C_{4}$ plants?

The $CO_2$ fixation during the Hatch and Slack pathway occurs in

Define the following terms:
$(1)$ Photorespiration
$(2)$ Bundle sheath

In the context of the $C_4$ pathway,the first step is .........