Describe how a variegated leaf is used to show that chlorophyll is necessary for photosynthesis
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In this experimental leaf, the part of the variegated leaf which contain green patches will give a positive test for starch i.e. iodine when added to this part of the leaf will turn into blue-black color. ... Thus this experiment proves chlorophyll is necessary for leaves to prepare starch through photosynthesis
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Take a variegated leaf of the potted plant kept in bright sunlight. ... The blue colour will not appear in variegated parts. This shows that starch formation takes place only in green (chlorophyll containing) parts of the leaf. Thus, the chlorophyll is essential for photosynthesis.
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