Question

Why is it important to spread the leaf on a white tile and not on a coloured one in the test of starch?

Answer 1

The leaf on the right shows a positive test for starch in the areas which contained chlorophyll, and a negative test for starch in the areas which lack chlorophyll. This is evidence that chlorophyll is required for photosynthesis. A plant can be 'de-starched' by leaving it in the dark for a few hours...

Answer 2

Answer:

white tile

Explanation:

On the white tile it is easy to see the colors after putting the iodine in it for the experment.