In $C_{4}$-plants,the bundle sheath cells

Under what conditions are $C_4$ plants superior to $C_3$ plants?

$A$ plant in your garden avoids photorespiration,has improved water-use efficiency,shows a high rate of photosynthesis at high temperatures,and has improved nitrogen-use efficiency. To which physiological group would you classify this plant?

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

The $C_4$ plants are photosynthetically more efficient than $C_3$ plants because

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?