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The frost or fog droplets seen on grass on winter mornings represent which state of the water cycle?

Answer and explanation

Correct answer: Condensation or deposition at low temperatures

The correct answer is B: condensation or deposition at low temperature. Air contains invisible water vapour. When a surface cools and the nearby air reaches its dew point, vapour changes into liquid droplets; this is condensation and produces dew or tiny fog droplets. If the surface temperature is below freezing, water vapour may change directly into ice on the grass without first becoming liquid; this is deposition and produces frost. A is wrong because transpiration is the release of vapour from plants, not the formation of droplets or ice. B is correct because it includes both possible low-temperature changes. C is wrong because groundwater outflow is liquid water emerging from below ground. D is wrong because dew and frost form locally from vapour, not by rain falling from clouds. Memory cue: dew is vapour to liquid; frost is vapour directly to solid.

Related tags

FrostDewCondensationHydrological CycleThe Living WorldBiologyClass 11 Mcq

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