Question

The part of leaf covered with aluminium foil was not exposed to sunlight. When it is dipped in iodine solution it shows-

Answer 1

Answer:

The areas of the leaf that were covered by the silver foil could not photosynthesise. This means they could not produce glucose and turn this to starch. So, when tested with iodine, these areas should remain pale.

Answer 2

Answer:

Starch is produced from glucose made during photosynthesis. Areas of the leaf exposed to the light should turn blue–black when iodine is added proving starch is present. This in turn, proves that photosynthesis occurred. The areas of the leaf that were covered by the silver foil could not photosynthesise. This means they could not produce glucose and turn this to starch. So, when tested with iodine, these areas should remain pale.

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