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Which is the primary dynamic factor that slows down the rate of evaporation during the hydrological cycle?

Answer and explanation

Correct answer: An increase in atmospheric relative humidity

Correct answer: B, an increase in atmospheric relative humidity. Evaporation occurs when water molecules leave a liquid surface and enter the air as vapour. The rate depends partly on how much water vapour the surrounding air already contains. When relative humidity is high, the air is closer to saturation, so there is a smaller difference between the vapour pressure at the water surface and that in the air. Fewer additional molecules can escape effectively, and evaporation slows. Option A generally increases evaporation by removing moist air from above the surface. Option C supplies more energy and generally speeds evaporation. Option D exposes more water surface to air and also tends to increase the rate. A useful cue is: dry, moving air favours evaporation; already humid air suppresses it.

Related tags

Relative HumidityEvaporationWater CycleWeather FactorsHydrological CycleThe Living WorldBiologyClass 11 Mcq

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