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A plant kept under a polythene bag in sunlight shows droplets on the inside of the bag because
ATranspired water vapour condenses on the cool surface
BPhotosynthesis pumps liquid water through the cuticle
CRoots ooze water straight through the polythene cover
DSoil moisture evaporates and passes through the bag
Answer & Solution
Correct answer: A. Transpired water vapour condenses on the cool surface
1. The leaves keep transpiring under sunlight.
2. The bag traps the vapour around the plant.
3. On the cool inner surface of the bag, vapour condenses to droplets.
4. So option A is the correct explanation.
_Source: Selina Concise Biology Class 8, Ch on Transport in Plants (Mistral OCR'd PDF), Polythene Bag Experiment_
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