Final answer:
Polysaccharides are complex carbohydrates that are formed by linkage of monosaccharides through condensation reactions and broken down by hydrolysis.
Step-by-step explanation:
Polysaccharides are complex carbohydrates formed when multiple monosaccharides are linked together by glycosidic bonds through a series of condensation reactions, also known as dehydration synthesis. Starch, a storage form of energy in plants, is one such polysaccharide, made from glucose monomers. This polysaccharide can be straight-chain, like amylose, or branched, like amylopectin. The human digestive system breaks down starches into glucose through a process called hydrolysis, where water is used to cleave the glycosidic bonds.