Glucose is sweet in teste but starch does not wether it is formed by collection of glucose??
Dear Hasibul,
In saliva, there is an enzyme, amylase which help in the break down of starch to sugar. Starch is a polysaccharide and polysaccharide are long chains of monosaccharides so they do not easily bind to the sweet receptors and doesnot cause change on our taste buds.
Good luck!