Final answer:
The iodine test for starch involves adding iodine solution to a starch solution, resulting in the formation of a blue-violet color due to the amylose-iodine complex.
Step-by-step explanation:
The iodine test for starch involves adding iodine solution to a starch solution. The expected observation is the formation of a blue-violet color. This color change occurs due to the formation of the amylose-iodine complex. The iodine test is a sensitive test that can detect even minute amounts of starch.