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Photosynthesis

a why is the ...

Question

(a) why is the leaf boiled in alcohol for a short time?
(b) why do we dip the leaf in water before adding the iodine solution?

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Solution

(a) The leaf is boiled for a short time to remove the chlorophyll.

(b) The leaf is dipped in water before adding the iodine solution in order to soften it.

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Q. A student is performing an experiment to show that sunlight is necessary for photosynthesis. In the first stage, he keeps a potted plant with green leaves in a dark place for about 3 days. Towards the end of the experiment, he boils one leaf in alcohol before using iodine for testing starch.
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(b) Why is the leaf boiled in alcohol before testing for starch with iodine?

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