Standard Science Primary 5 Cycles

Early in the morning, Alexa noticed tiny drops of water on the grass in her garden, even though it did not rain the night before. How did the drops of water form?

A Water from the soil evaporated onto the grass.
B The grass released excess water through its leaves.
C Water vapour in the warm air lost heat to the cool grass and condensed.
D The air gained heat from the grass and melted into water.
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Worked Solution

Step 1: At night, the temperature drops, causing surfaces like grass to become cool. Step 2: The surrounding air contains warm water vapour (gas). Step 3: When the warm water vapour touches the cool grass, it loses heat. Step 4: It condenses into liquid water droplets, which we call dew.

Correct answer: Water vapour in the warm air lost heat to the cool grass and condensed.

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