B4.7.2.1

Levels of organisation

Content

  1. Students should understand that photosynthetic organisms are the producers of biomass for life on Earth.

Feeding relationships within a community can be represented by

food chains. All food chains begin with a producer which synthesises molecules. This is usually a green plant or alga which makes glucose by photosynthesis.

A range of experimental methods using transects and quadrats are used by ecologists to determine the distribution and abundance of species in an ecosystem.

In relation to abundance of organisms students should be able to:

  • understand the terms mean, mode and median
  • calculate arithmetic means
  • plot and draw appropriate graphs selecting appropriate scales for the axes.
  1. Producers are eaten by primary consumers, which in turn may be eaten by secondary consumers and then tertiary consumers.
  2. Consumers that kill and eat other animals are predators, and those eaten are prey. In a stable community the numbers of predators and prey rise and fall in cycles.

Recognise/draw/interpret diagrams. Translate from data to a representation with a model. Use models in explanations, or match features of a model to the data from experiments or observations that the model describes or explains. Make predictions or calculate quantities based on the model or show its limitations. Give examples of ways in which a model can be tested by observation or experiment.

Find arithmetic means,

Understand the terms mean, mode and median,

Translate information between graphical and numeric form,

Plot two variables from experimental or other data,

Translate information between graphical and numeric form