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Test for Carbohydrates

A portion of ...

Question

A portion of destarched leaf of a potted plant was covered with a black strip of paper. The plant was exposed to sunlight for six hours and then tested for starch. It was observed that :

A

both covered and uncovered parts turned blue black

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B

both covered and uncovered parts turned brownish yellow

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C

only the uncovered part turned blue black

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D

only the covered part turned blue black

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Solution

The correct option is D only the uncovered part turned blue black
To show that sunlight is necessary for photosynthesis, first take a plant with destarched leaves.
Cover a part of one of its leaves with black paper and place it in sunlight.
After few hours, perform iodine test on this leaf.
Part of leaf covered with black paper appears brown while the uncovered region turns blue-black.
Portion of leaf uncovered showed presence of starch due to photosynthesis.

So the correct answer is option C.

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