Question

a potted plants is covered with a transparent polythene sheet. the sheet became wet from inside after a few hours.why?

Answer 1

because of evaporation
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Answer 2

the plant transpires water in the form of water vapour from the aerial parts such as leaves. when the plant is covered with polythene bag, the water vapours gets condenses into water droplets which appears on the inner side of the polythene bag and the bag becomes wet