An ecologist uses pitfall traps to compare ground-dwelling invertebrates in two areas of an orchard. In one area, the containers are placed with their rims 2 cm above the soil surface.
Explain the consequence of this error and justify a correction to the method.
109 exam-style questions on OCR GCSE Biology 6.1 Monitoring and maintaining the environment, covering 6.1.1 Field investigation of distribution and abundance, 6.1.2 Human interactions and biodiversity, 6.1.3 Maintaining biodiversity, and 6.1.4 Environmental change and distribution of organisms. Each one has a worked solution and a mark scheme showing where the marks go.