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A long-term drought is the direct result of the severe disruption of which balance in the water cycle?

Answer and explanation

Correct answer: Precipitation being significantly lower than evaporation for a prolonged period

Answer: B. A long-term drought develops when water is lost from a region through evaporation, plant transpiration, runoff, or human use, while precipitation remains insufficient for an extended period. The key imbalance is that incoming water, especially rain or snow, is much less than the water demand and losses. A is incorrect because evaporation does not need to stop; drought can occur while evaporation continues. C is incorrect because groundwater does not suddenly boil as a normal cause of drought. D is incorrect because wind may influence weather and evaporation, but complete stoppage of atmospheric movement is not the defining balance. Drought severity also depends on soil storage, vegetation, reservoirs, and groundwater. Memory cue: drought means prolonged water input below water loss and demand.

Related tags

DroughtPrecipitationEvaporationHydrological CycleThe Living WorldBiologyClass 11 Mcq

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