A student estimates the number of limpets on a rocky shore.
The student only places quadrats where limpets can be seen.
What effect will this have on the estimate?
It will be too high, because limpets will move into the quadrats.
It will be too low, because limpets hidden under rocks are missed.
It will be accurate, because every quadrat will contain limpets.
It will be too high, because areas with few limpets are left out.
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.