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Which option gives the correct reason for vertical decrease of humidity?

Answer and explanation

Correct answer: Main source of water vapour is near ground and water surfaces

Correct answer: B. Most atmospheric water vapour enters the atmosphere from sources near Earth’s surface, including oceans, lakes, rivers, wet soil, and vegetation. Evaporation and transpiration add moisture mainly to the lower atmosphere. As altitude increases, temperature generally decreases and the air becomes farther from these moisture sources. Water vapour may condense, precipitate, or mix unevenly, so its amount usually decreases with height, especially above the lower atmosphere. A is incorrect because oceans do not increase upward. C is incorrect because upper air does not always produce rain; rainfall requires specific cloud and precipitation conditions. D is incorrect because plants are not more numerous in the stratosphere, and the stratosphere is not the main source of atmospheric moisture. B correctly identifies the location of the principal sources of water vapour. The statement is about a general vertical pattern, not an absolute rule at every place and time. Memory cue: the main moisture sources are below, so humidity generally decreases upward.

Related tags

GeographyVertical HumidityWater VapourAtmosphereHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereClass 12 Mcq

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