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This lesson describes the experimental methods using quadrats and transects to determine distribution and abundance of species in an ecosystem. The PowerPoint and accompanying resources are part of the second lesson in a series of 2 lessons which have been planned to cover the content of specification point 7.2.1 (Levels of organisation) as described in the AQA GCSE biology and combined science specifications.

The lesson begins by challenging the students to recognise the term “random” using four synonyms. This introduces quadrats as a piece of equipment that are fundamental to a random sampling method to determine abundance. The steps of the method are described and students are shown how the estimate population size using the mean and the area of the habitat. Time is taken to consider quadrats which do not have an area of 1 metre squared and the adjustments to the method which will be needed. A series of exam-style questions allow the students to assess their understanding and the mark schemes are embedded into the PowerPoint.

The remainder of the lesson considers the use of transects in determining distribution and again a series of tasks, including prior knowledge checks, will allow the students to assess their progress.

The first lesson in this series of 2 lessons describes the levels of organisation in an ecosystem and how feeding relationships can be represented in a food chain.