Why Change in color of the seed on the cut surface when iodine solution is added?

The change in color of the seed on the cut surface when iodine solution is added indicates the presence of starch. Iodine binds to starch molecules, forming a blue-black complex. This reaction occurs because starch is a polysaccharide, and the iodine interacts specifically with its helical structure. Thus, a color change signifies that starch is present in the seed tissue.