Question

Why does the leaf from the plant kept in dark does not turn blue ?

Answer 1

Answer:

The leaf plucked out from the plant kept in dark does not turn blue on adding iodine solution because of the absence of starch in the leaves of the plant.

Explanation:

The starch that have been stored in the leaves got used up when the plant was kept in dark for sometime. It happened because the plant was not able to perform photosynthesis without sunlight and thus glucose was not formed. Therefore, to meet the energy requirements, the plant used the starch (extra glucose) stored in the leaves.

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