b)+Feeding+relationships

Section 4- Ecology and the environment a) The organism and the environment - b) Feeding relationships - c) Cycles within ecosystems - d) Human influences on the environment

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 * Starter**
 * Watch this Discovery News video on What would happen if sharks disappeared? and discuss it's relevance to the topic you are learning (download video here if the link isn't working)
 * What does the arrow mean in a food chain? Discuss

4.4 explain the names given to different trophic levels to include producers, primary, secondary and tertiary consumers and decomposers 4.5 understand the concepts of food chains, food webs, pyramids of number, pyramids of biomass and pyramids of energy transfer 4.6 understand the transfer of substances and of energy along a food chain 4.7 explain why only about 10% of energy is transferred from one trophic level to the next.
 * Learning outcomes (s//tudents will be assessed on their ability to)//:**

After/between tutorials complete the workbook either by yourself or with study partner. Extension sections/activities are the more challenging activities, if you cannot complete them, or if it takes you too much time, skip them and return to them when all the regular tasks have been completed.
 * Approach**

The workbook, in word format, can be found and downloaded from here media type="custom" key="27835733" [|pdf version] for those with compatibility issues

Some tasks require you to construct pyramids. Use the Excel workbook below to help you do so quickly. Some tasks specifically ask you to do this by hand, as this is a necessary skill to learn. media type="custom" key="27835757" //N.B. The graph display is not shown properly in the preview window.//


 * Resources**
 * // Green book reference: p155-158 //**

These video tutorials from [|Click4Biology]address each learning outcome. It's recommended that you use them both as part of your learning and your revision. Download links are provided for those who have trouble accessing Youtube.

4.4 Trophic levels [|download] media type="custom" key="23690562"

4.5a Food chains [|download] media type="custom" key="23690560"

4.5b Food webs [|download] media type="custom" key="23690558"

4.5c Pyramids [|download] media type="custom" key="23690554"

4.6 Energy and substances in food chains [|download] media type="custom" key="23690550"

4.7 Energy efficiency [|download] media type="custom" key="23690548"