Answer:
1. A carbohydrate is a biomolecule made up of carbon, hydrogen, and oxygen which generally have an empirical formula [tex]C_{m}(H_{2}O)_{n}[/tex] where m and n may differ.
Thus, the elements are carbon (C), hydrogen (H), and oxygen (O).
2. Monomer is defined as a molecule which bonds with identical molecule to form a chain or polymer.
Different monomer units such as glucose, fructose, galactose, and xylose are used to form different types of polymers or polysaccharides such as amylose, cellulose, glycogen et cetera.
3. The main function of carbohydrate in living organism is to provide energy.
4. Let us take an example of sucrose. It is a disaccharide formed by two monomer units glucose and fructose. The structure is shown in the figure below.
