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What causes water to collect on leaves during a humid night in an agricultural field?

Answer and explanation

Correct answer: Cooling of the leaf surface to the dew point

Correct answer: A. During a clear or calm night, a leaf may lose heat to its surroundings and cool significantly. If its surface temperature falls to the dew point of the nearby moist air, the air next to the leaf becomes saturated. Water vapour then condenses into small liquid droplets on the leaf, producing dew or leaf wetness. A is correct because reaching the dew point is the direct condition for this surface condensation. B is impossible and unrelated to dew. C is wrong because evaporation removes liquid water, whereas the question describes water collecting. D is wrong because water vapour does not change into nitrogen in this process. Dew may affect crop wetness, but its immediate cause is cooling and condensation. Memory cue: cool surface plus moist air equals dew.

Related tags

DewAgricultureLeaf WetnessForms Of Condensation: DewFrostFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeographyClass 12 Mcq

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