Which of the following is an example of a polysaccharide?

A polysaccharide is a complex carbohydrate composed of long chains of monosaccharide units. These molecules serve various functions such as energy storage and structural support in living organisms.

Starch is the correct answer because it is a polysaccharide consisting of numerous glucose units linked together. It is primarily used by plants to store energy and can be broken down into glucose when needed.

On the other hand, glucose and fructose are both monosaccharides, which are the simplest form of carbohydrates and consist of single sugar units. Sucrose, while made up of two monosaccharides (glucose and fructose), is classified as a disaccharide. Thus, these other options do not meet the criteria of being a polysaccharide.