Observe the experimental set up below and select the leaf that represents the correct observation after addition of iodine solution.

Leaf a

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Leaf b

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Leaf c

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Leaf d

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Solution

The correct option is A Leaf a
The portion of the leaf covered by aluminium foil will not be able to undergo photosynthesis. Hence, there will be no formation of starch. Iodine turns blue black in the presence of starch. Hence the portion covered by aluminium foil remains yellow indicating absence of starch. The uncovered portion contains starch turning the leaf blue black.

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