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

The $C_{4}$-plants are photosynthetically more efficient than $C_{3}$-plants because

Choose the correct statements regarding $C_4$ plants:
$(1)$ $C_4$ plants do not tolerate higher temperatures.
$(2)$ $C_4$ plants show a response to high light intensities.
$(3)$ $C_4$ plants lack a process called photorespiration.
$(4)$ Productivity of $C_4$ plants is less than $C_3$ plants.
$(5)$ $C_4$ acid $OAA$ is formed in the mesophyll cells.

Which one is a $C_4$ plant?

$CO_{2}$-fixation $C_{4}$ pathway was proposed by:

In succulent xerophytes,there is an accumulation of malic acid at night. This path of $CO_2$ metabolism is called: