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

Which of the following is a $C_4$ plant?

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

In succulent plants,the stomata open at night and close during the day. Which among the following would be the best hypothesis to explain the mechanism of stomatal action at night only?

$PEP$case and $RuBisCO$ in $C_4$ plants are present respectively in

In $C_{4}$-plants,the RuBisCO enzyme is present in: