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Mouth, Teeth and Salivary Gland

Why do we boi...

Question

Why do we boil the leaf in alcohol when we are testing it for starch?

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Solution

We boil the leaf in alcohol to remove chlorophyll from it while testing for starch.

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Why do we boil the leaf in alcohol when we are testing it for starch?

Q. (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?

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.
(a) Why is the plant kept in a dark place for about 3 days?
(b) Why is the leaf boiled in alcohol before testing for starch with iodine?

Q. Before testing the leaf for starch at the end of the experiment "Light is necessary for photosynthesis":
(a) In which liquid the leaf should be boiled?
(b) Why should the leaf should be boiled in this liquid?

Q. Before testing the leaf for starch at the end of the experiment, ‘light is necessary for photosynthesis’, the experimental leaf should be boiled in:

(1) Water
(2) Alcohol
(3) KOH solution
(4) Hydrochloric acid

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Mouth, Teeth and Salivary Gland

Standard VII Biology

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