To test the presence of starch ,why do we warm the leaves in alcohol or methylated spirit ?
Answers
Hi!
we warm the leaves in alcohol or methylated spirit to remove the green pigment (namely chlorophyll) to observe the change in color better for the starch test.
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Answer:
The answer to the given question is for removing the green pigment of a leaf called chlorophyll to observe the colour change from brown to blue in the presence of iodine.
Explanation:
The leaf is warmed in alcohol or methylated spirit to test the presence of starch.
Starch is a carbohydrate which consists of many units of glucose and they are attached by glycosidic bonds.
The starch is a poly saccharide that is produced as an energy reserve by green plants.
when the leaf is boiled with alcohol the green colour of the leaf is removed and chlorophyll also extracts from the leaf.
on removing the green colour the leaf appears in white, which is easy to observe the colour change of iodine.
starch gives blue colour with the iodine.
Whereas alcohol is used to soften the cuticle of the leaf.
alcohol stops the reaction of the plant cell by removing the chlorophyll.
It is used to make plant cells permeable.
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