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4.1 Ecosystems

  • Can you define the terms population, community, habitat and ecosystem?
  • How would you use a quadrat to estimate the population size of an organism in two different areas?
  • How would you use a quadrat to measure the distribution of organisms?
  • What are the names given to different trophic levels?
  • What are food chains, food webs, pyramids of number, pyramids of biomass, and pyramids of energy transfer?
  • How are substances and energy passed along a food chain?
  • Why is only about 10% of energy transferred from one trophic level to the next
  • What are the stages in the carbon cycle?
  • What are the stages in the nitrogen cycle? You should be able to recall the roles of bacteria (but specific names of bacteria are not required).
  • What are the stages in the water cycle?

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Watch this video to discover what an ecosystem is.

Watch this whole series of videos from crash course kids, they really cover everything you need to know about ecosystems, food chains, food webs and energy flow.

Click here to see what Tim and Moby find in this desert ecosystem.

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Watch this video to learn all about trophic levels.

Watch this video to learn about ecological pyramids.

Click here to learn more about pyramids of energy.

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Click here to construct your own food web.

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Click here to see an animation of the carbon cycle. Click each process to see how the carbon moves.

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Not one hundred percent convinced by this animation but actually it does cover most of the main points of the nitrogen cycle even though it is aimed at 5 year olds!

This animation covers it in a little more detail, remember you don’t need to know that names of the bacteria involved

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Click here to see an interactive water cycle diagram.

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Click here to see a video explaining the main stages of the water cycle.

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Click here to see another good water cycle interactive diagram.

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