Standard Science Primary 4 Energy

In a cold country, birds fluff up their feathers to stay warm. How does this help them?

A Fluffed feathers make the bird look bigger and scarier.
B Fluffed feathers trap air, which is a poor conductor of heat.
C Fluffed feathers allow heat to enter the body from the air.
D Fluffed feathers produce more body heat.
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Worked Solution

Step 1: Air is a very poor conductor (good insulator) of heat. Step [2-9]: Fluffing feathers creates more space to trap air close to the skin. Step [2-9]: This trapped air reduces the rate of heat loss from the bird's body to the cold surroundings.

Correct answer: Fluffed feathers trap air, which is a poor conductor of heat.

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