Which enzyme catalyzes $CO_2$ fixation in $C_4$ plants?

Malic acid or aspartic acid and oxaloacetic acid both are found in

Who first demonstrated the $C_4$ pathway?

Describe the $C_4$ pathway.

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.

Kranz anatomy is found in which of the following?