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# Key Area 3.4

### Revision for Key area 3.1 Energy in Ecosystems

What do the arrows represent in a food chain? The flow of energy
State two ways energy is lost from a food chain Undigested materials, Heat, Movement
How much energy is lost from a food chain? 90%
How much energy is passed from one level of a food chain to another? 10%
What is the energy that is passed through the food chain used for? Growth
Name the type of pyramid which shows the number of organisms (the population) in each level of a food chain. Pyramid of Numbers
Name the type of pyramid which shows the energy in each population of a food chain Pyramid of Energy
Describe the trend of a pyramid of numbers As you move up a food chain the numbers decrease and the individual size increases
Describe the trend of a pyramid of energy As you move up a food chain the energy decreases
Created by: MissBryce

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