What does $X$ represent in the given structure?

In animals,food is stored as $..............$,and in plants,food is stored as $..............$.

The most common monomer of carbohydrates is:

What is the general formula for a monosaccharide?

Statement $P$ : Disaccharides can undergo hydrolysis by boiling with dilute acids or by reacting with appropriate enzymes.
Statement $Q$ : The result of hydrolysis is the release of their constituent monosaccharide units.

$A$ molecule of disaccharide is formed by the formation of a glycosidic bond between which two sugars?