Who studied the ultrastructure of bundle sheath cells?

$\text{RuBisCo}$ enzyme is absent in :

Study the pathway given below. In which of the following options are the correct words for all the three blanks $A$,$B$,and $C$ indicated?

$C_4$ plants are more efficient in photosynthesis because they obtain more $CO_2$ due to:

Choose the incorrect pair.

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