Question

.Write the procedure you follow to test the presence of starch in leaves​

Answer 1

Explanation:

To test leaves for the presence of starch one has to do the following steps:-

• the leaf is boiled in water
• then the boiled leaf is placed in a boiling tube containing 90% ethanol (ethyl alcohol).
• The ethanol boils and the green colouring (chlorophyll) is removed from the leaf.
• The iodine reagent is then added, which causes the green areas on the leaf, where starch is supposedly present, to turn to a blue-black colour.

This indicates the presence of starch in the leaf.

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Answer 2

$\pink{Starch \: \: testing\::}$

1. Iodine solution is used to test leaves for the presence of starch.
2. After a few minutes, the parts of the leaf that contain starch turn the iodine from brown to blue/black.
3. The leaf on the left is a variegated leaf.

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