Yes, starch is considered a macromolecule. Macromolecules are large, complex molecules that are typically composed of many smaller subunits called monomers. In the case of starch, it is a polysaccharide formed by the polymerization of glucose monomers.
Starch serves as a storage form of energy in plants and is made up of two types of molecules: amylose, which is a linear chain of glucose units, and amylopectin, which is a highly branched structure. The size and complexity of starch molecules allow them to store significant amounts of energy, which can be broken down and utilized by plants and animals.
Due to its large size and structural complexity, starch is classified as a macromolecule, along with proteins, nucleic acids, and other polysaccharides.