Question

i) To test the presence of starch ,why do we warm the leaves in alcohol or methylated spirit ? ii) Why alcohol is heated in a water bath instead of heating it directly ? iii) While performing iodine test on leaf , which colour does it give if starch is present ? iv) What would happen to the level of starch in leaves , when the plant is kept in a darkroom for 2 – 3 days ?​

Answer 1

Answer:

1.We boil the leaf in alcohol when we are testing it for starch because to remove the green pigment chlorophyll present in it. For the starch test, we need to observe the colour change from brown to blue when iodine is put on the leaf.

Explanation:

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Answer 2

Answer:

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