Question

why do we remove the chlorophyll of the leaf before performing the starch test?

Answer 1

Chlorophyll is a green pigment and so masks the colour change of the iodine test for starch. Chlorophyll needs to be removed from the leaf i.e. the leaf needs to be ' decolourized' for changes to be observed. A decolourized leaf is pale yellow or green.

Answer 2

we Chlorophyll is a green pigment and so masks the colour change of the iodine test for starch. Chlorophyll needs to be removed from the leaf i.e. the leaf needs to be ' decolourized' for changes to be observed. A decolourized leaf is pale yellow or green. Ethanol is an organic solvent and so extracts chlorophyll from the leaf.