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Science at key stage 3    (Year 8)

Unit 8D: Ecological relationships
Section 12: How do plants, animals and environmental conditions interact in a habitat? d) How big are the populations in the habitat? (2)

QCA

Objectives
Children should learn:
  • that abundance of organisms in habitats is affected by environmental factors such as availability of light, water and nutrients
  • that distribution of organisms in an environment is affected by environmental factors
  • that the size of a population depends on resources

Activities

Outcomes
Children:
  • Ask pupils to represent the data graphically, to make comparisons of the data and to suggest reasons for the distribution of organisms. Encourage them to consider the range of resources needed by animals, eg nesting sites, mates, and how environmental differences affect numbers and distribution of organisms. They should also be able to suggest ways in which organisms may influence each other, eg a large tree shading the area below it, preventing other plants from growing; availability of food influencing animal distribution.
  • Help pupils to bring together all the work resulting from their field trip as a classroom display.
  • suggest how environmental factors, eg availability of light, water and nutrients, affect numbers of organisms
  • describe how the distribution of organisms depends on environmental factors
  • explain how the size of a population depends on resources

Points to note
  • Data collected in the field may need to be supplemented by data from secondary sources.
  • If possible, compare results with those from a previous year. Building up long-term data can help to make sense of some of the variables noted.

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 can animals be classified? (1)
2. How can animals be classified? (2)
3. How can green plants be classified?
4. How do plants, animals and environmental conditions interact in a habitat? a) How can we collect data to answer questions about a habitat? (1)
5. How do plants, animals and environmental conditions interact in a habitat? a) How can we collect data to answer questions about a habitat? (2)
6. How do plants, animals and environmental conditions interact in a habitat? b) What lives there? (1)
7. How do plants, animals and environmental conditions interact in a habitat? b) What lives there? (2)
8. How do plants, animals and environmental conditions interact in a habitat? c) Why do the communities differ in different habitats? (1)
9. How do plants, animals and environmental conditions interact in a habitat? c) Why do the communities differ in different habitats (2)
10. How do plants, animals and environmental conditions interact in a habitat? c) Why do the communities differ in different habitats? (3)
11. How do plants, animals and environmental conditions interact in a habitat? d) How big are the populations in the habitat? (1)
12. How do plants, animals and environmental conditions interact in a habitat? d) How big are the populations in the habitat? (2)
13. How do living things in a community depend on each other? (1)
14. How do living things in a community depend on each other? (2)
15. Reviewing work