Question

what colour is a leaf which is negative for starch​

Answer 1

Answer:

The white part of the leaf does not contain chlorophyll, so does not photosynthesise. 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.

Explanation:

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Answer 2

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The white part of the leaf does not contain chlorophyll, so does not photosynthesise. The leaf on the right shows a positive test for starch in the areas which contained chlorophyll, and anegative test for starch in the areas which lack chlorophyll. This is evidence that chlorophyll is required for photosynthesis.