Polar bears have thick fur that traps air. How does this air helps the bear during winter ?A. The air reduces thermal (heat) energy flow to the environment.B. The air produces thermal (heat) energy to keep the bear warm.C. The air transforms chemical energy to thermal (heat) energy.D. The air transfers thermal (heat) energy from environment to the bear.
Question
Polar bears have thick fur that traps air. How does this air helps the bear during winter ?A. The air reduces thermal (heat) energy flow to the environment.B. The air produces thermal (heat) energy to keep the bear warm.C. The air transforms chemical energy to thermal (heat) energy.D. The air transfers thermal (heat) energy from environment to the bear.
Solution
The correct answer is A. The air reduces thermal (heat) energy flow to the environment.
Here's why:
-
Polar bears have thick fur that traps a layer of air close to their skin.
-
This trapped air acts as an insulator, which means it reduces the flow of heat energy.
-
In the cold winter environment, the bear's body produces heat to keep warm.
-
The insulating layer of air trapped by the fur reduces the amount of this heat energy that can escape to the colder environment.
-
Therefore, the bear stays warmer because less of its body heat is lost to the surrounding cold air.
So, the air doesn't produce or transform any energy (which rules out options B and C), and it doesn't transfer heat from the environment to the bear (which rules out option D). Instead, it reduces the amount of the bear's body heat that is lost to the environment (option A).
Similar Questions
Polar bears are adapted to stay warm by growing thick fur. These organisms most likely live in a .
True or false? The fur of a polar bear is an adaptation to help it survive extreme cold.
To reduce heat loss from the body to the cold environment, animals have closely packed hair /fur (Walrus, Seal) or (Penguin).
What must an arctic fox do in order to keep its body from becoming too cold?A.Migrate to warmer areasB.Rest on a warm surface in the sunC.Lose fat during the warmer monthsD.Eat energy-rich foods
4. A high-quality sleeping bag will keep you warm even during a winter camping trip high in the mountains. How do you stay warm when the air around you is very cold? A. The sleeping bag produces thermal energy that keeps you warm. B. The sleeping bag transfers thermal energy from the air to your body. C. The sleeping bag slows the transfer of thermal energy produced by your body into the air. D. The sleeping bag increases the production of thermal energy by your body.
Upgrade your grade with Knowee
Get personalized homework help. Review tough concepts in more detail, or go deeper into your topic by exploring other relevant questions.