What does $P$ represent in the given figure?

Identify $X$ in the figure below.

Hydrolytic enzymes that do not show activity at low pH are called .......

Maltose $+$ $H_2O$ $\to$ Glucose $+$ Glucose. Which enzyme is responsible for this reaction?

An enzyme obtained from an animal source has been classified by the Enzyme Commission and allocated its unique four-digit number $1.2.1.4$. To which of the following classes does it belong?

$A$: In a feverish condition,the rate of physiological processes in the body decreases.
$R$: Enzymes are temperature-sensitive.