Question

4. What is bleaching of leaf? Why is it
necessary to do before conducting tests for
presence of starch?​

Answer 1

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The extraction or the removal of chlorophyll from a leaf is called bleaching of the leaf. Starch is bleached before testing for starch to remove chlorophyll as it would be helpful in colour testing after iodine test.

I hope the above text perfectly helps you mate

Answer 2

Answer:

The removal of chlorophyll from a leaf is called bleaching of the leaf.

It is removed because it contains chlorophyll on it and the chlorophyll is removed to absorb iodine solution which will later turn into blue black color to show it's presence

I hope it will help you