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Science at key stage 3    (Year 7)

Unit 7C: Environment and feeding relationships
Section 9: b. What do food webs tell us?

QCA

Objectives
Children should learn:
  • that all the organisms in a habitat can be linked together in food webs
  • to find information using contents, index, glossary, key words or hotlinks

Activities

Outcomes
Children:
  • Provide pupils with secondary sources, eg reference books, CD-ROMs, databases, to find information about the diet of animals identified in the previous activity, and remind them how to use the index, contents section, key words and hotlinks. Ask them to add the information to the database. Ask them to use the information to construct food chains using the species identified, and to describe what the food chains show. Help the pupils to link their food chains together into a food web. Challenge the pupils to explain any missing links, eg absence of carnivores, such as owls or hawks. Help pupils to produce a display of their food web(s).
  • use organisational features of text to identify relevant information about the diet of animals
  • place food chains within a food web
  • describe how all the organisms in a habitat can be linked together in food webs
  • sequence a food chain
  • recognise that arrows in a food web or food chain show the direction of energy flow

Points to note
  • Pupils may need reminding that food webs are the focus of the activity, as they may have found out about the food source of a local animal in key stage 2.
  • Pupils often have difficulty with the idea that arrows in a food chain represent energy flow. This could be reinforced here.

Sections in this unit

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This unit is divided into sections. Each section contains a sequence of activities with related objectives and outcomes. You can view this unit by moving through the sections or print/download the whole unit.
1. How does the environment influence the animals and plants living in a habitat?
2. a. How do environments vary?
3. b. How do environments vary?
4. c. How do environments vary?
5. Checking progress
6. a. What is a feeding relationship?
7. b. What is a feeding relationship?
8. a. What do food webs tell us?
9. b. What do food webs tell us?
10. c. What do food webs tell us?
11. Reviewing work