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Test for Chlorophyll

Only green pa...

Question

Only green parts of a leaf give iodine test positive in the presence of ___.

A

starch

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B

protein

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C

both starch and protein

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D

any carbohydrate

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Solution

The correct option is A
starch

Green parts of a leaf give iodine test positive in the presence of starch, thus proving chlorophyll is necessary for photosynthesis.

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Q. The iodine test for starch is mainly performed to test the presence of carbohydrates.

Enumerate the steps involved in testing a green leaf for the presence of starch.

Q. You have been supplied with a sample of food. How will you perform tests for the presence of starch and proteins in it?

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Q. In an experiment to test the presence of starch in a leaf, the plucked leaf is first boiled in water for a few minutes. This is an important step in the experiment because it :
(1) converts glucose made in the leaf into starch
(2) dissolves chlorophyll present in the green leaf
(3) extracts starch to destarch the leaf
(4) makes the leaf more permeable to iodine solution

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