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Transpiration

An apparatus ...

Question

An apparatus shown alongside was set up in sunlight for about an hour. It was observed that drops of water appeared on the inside of the polythene bag.
Why the pot and its soil were left uncovered by the polythene bag?

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Solution

The pot and the soil are left uncovered to show that the water vapour deposited on the polythene bag is from the aerial parts of the plant and not from the roots or soil.
Thus, explaining the occurrence of transpiration in the apparatus.

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