Provide the full names for the following abbreviations:
$(1)$ $PEP$
$(2)$ $PEPcase$

Assertion: $C_4$ pathway of $CO_2$ fixation is found in some tropical plants.
Reason: In this pathway,$CO_2$ is fixed by $3C$ compound.

Number of carboxylation reactions in the $C_4$ cycle is/are:

Describe the internal anatomy of $C_{4}$ plants.

The source of $CO_2$ for photosynthesis during the day in $CAM$ plants is:

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