Which of the following is a type of polysaccharide?

Starch is a type of polysaccharide, which is a complex carbohydrate made up of long chains of glucose units linked together. Polysaccharides serve various functions in living organisms, such as energy storage and providing structural support. Starch specifically functions as an energy reserve in plants, allowing them to store glucose for later use. It is one of the most significant sources of carbohydrate in the human diet, found in foods like potatoes, rice, and grains.

On the other hand, glucose, sucrose, and fructose are either simple sugars or disaccharides. Glucose and fructose are monosaccharides, which are the simplest form of carbohydrates, while sucrose is a disaccharide that consists of glucose and fructose linked together. These other options do not exhibit the complexity or functionality that characterizes polysaccharides like starch. Thus, starch is correctly identified as the only polysaccharide among the given choices.