The source of $CO_2$ for photosynthesis during the day in $CAM$ plants is:

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

Which of the following is not correct for $C_4$ plants?

Photosynthesis in ${C_4}$ plants is relatively less limited by atmospheric $CO_2$ levels because

In the maize plant,$CO_2$ fixation occurs in both mesophyll and bundle sheath cells. The enzymes involved in these cells for the process respectively are

$C_4$ plants are more efficient at photosynthesis than $C_3$ plants because........