Who studied the ultrastructure of bundle sheath cells?

As compared to a ${C_3}$ plant,how many additional molecules of $ATP$ are needed for the net production of one molecule of hexose sugar by ${C_4}$ plants?

Plants like sugarcane show high productivity and high efficiency of $CO_2$ fixation,because of

In which type of plants do the stomata remain closed during the daytime and open during the night?

Which of the following characteristics does $NOT$ apply to desert plants?

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