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Why is the role of vegetation surfaces clear in dew formation?

Answer and explanation

Correct answer: They cool quickly at night and provide surfaces for droplets

Correct answer: A. Dew forms when a surface loses heat, usually during a clear and calm night, and cools to or below the dew point while remaining above freezing. Leaves, grass blades, and other vegetation have exposed surfaces that cool efficiently by radiation. Water vapour then condenses on these cool surfaces as visible liquid droplets. Option A is correct because it states both important ideas: rapid night-time cooling and a surface on which droplets collect. Option B is wrong because vegetation does not always destroy water vapour; moisture in the air is needed for dew. Option C is wrong because vegetation does not make the air completely dry, and completely dry air would prevent dew. Option D is wrong because plants do not permanently block sunlight; the relevant process occurs mainly during night-time cooling. Memory cue: dew is found on cool leaves and grass because they act as small condensation surfaces.

Related tags

DewVegetationSurface CoolingCondensationForms Of Condensation: DewFrostFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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