Question

how would yiu test the presence of starch in leaves

Answer 1

Take one leaf from each of the plants. Put few drops of iodine solution on each of the leaves. The leaf kept in the sunlight will turn blue-black due to presence of starch. The leaf kept in the dark will not turn blue-black because of absence of starch.

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Answer 2

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First dip the leaf in alcohol in a beaker. Place the beaker in boiling water and then take out the leaf and dip it in iodine solution.

where you see Blue black Patches on the leaf there starch is present .

Is that the answer. I hope it is correct.

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