Why should we choose a variegated leaf for demonstrating that chlorophyll is necessary for photosynthesis?
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we do so because the part which is green has chlorophyll and is the part of experiment set up but the non-green part of leaf acts as control (to compare between between the leaf with or without chlorophyll).
this basically reduces our effort to kill chlorophyll in a whole new leaf and then observe it separately.
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The variegated leaf experiment helps to exhibit that chlorophyll (pigment present in the green parts of plants) is necessary for photosynthesis. ... Parts of the leaf with the chlorophyll should turn blue-black when iodine is added showing the starch is present. This, in turn, proves that photosynthesis happened.
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