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Setting the scene
Setting the scene
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Input
Animals in Cold Climates
Animals in Cold Climates
Arctic animals must keep themselves warm to survive.
You lose body heat through your body surface, mainly your skin.
Arctic animals have developed many adaptations to help them survive…
Polar Bear
Penguin
Walrus
Arctic fox
Look at the pictures. What do these animals have in common?
Look at the pictures. What do these animals have in common?
Animals in Dry Climates
Animals in Dry Climates
Animals in dry climates have to keep themselves cool to survive.
They also have to cope with a lack of water.
This means they are unable to lose heat through sweating – why?
Thompsons Gazelle
Dromedary Camel
Desert Fox
Bat-eared fox
Look at the pictures. What do these animals have in common?
Look at the pictures. What do these animals have in common?
Surface area to volume ratio
Surface area to volume ratio
Animals that live in cold environments need to have smaller surface area to volume ratio. This means that for their size they need to have as little surface exposed to the elements as possible.
Animals lose heat from the body surfaces that are in contact with the surrounding air/water.
Reducing this contact surface reduces heat loss
Increasing the surface increases heat loss
Both of the examples above have the same volume. However, the diagram on the right has a larger surface area. This is because it now has more surfaces exposed. In the first diagram, those surfaces are hidden inside.
Final check
Final check
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