$CAM$ helps the plants in

In $CAM$ cycle,during the formation of malic acid,stomata remain:

In which of the following is '$Kranz$' anatomy found?

In the leaves of $C_4$ plants,malic acid formation during $CO_2$ fixation occurs in the cells of

The correlation between 'Kranz' anatomy and the $C_4$ pathway of $CO_2$ assimilation was first established by:

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.