The monomer of starch is glucose. Starch is formed by the polymerization of glucose, so its monomer is glucose.

Starch (English: starch, amylum) is a polymerized carbohydrate consisting of a large number of glucose units linked by glycosidic bonds and is a polysaccharide. Starch is also the most common carbohydrate in the human diet and is widely found in staple foods such as potatoes, wheat, corn, rice, and cassava.

Applications of starch:

Paper production:

Paper production is the largest non-food application of starch in the world, with millions of tons consumed annually. For example, in a typical sheet of copy paper, the starch content can be as much as 8 percent of the paper's weight.

Corrugated Board Adhesives:

Corrugated board adhesives are the second largest non-food application of starch in the world.

Garment Starch:

Garment or laundry starch is prepared by mixing vegetable starches in a liquid prepared by boiling in water (older preparations are also available) and is used for sizing garments.

References to the above: Baidu Encyclopedia-Starch