A student compares the number of dandelions in a sunny area and in a shaded area of a park.
Which variable should the student control?
the light intensity in each of the two areas
the size of the quadrat used in each area
the number of dandelions found in each area
the position of each quadrat in each area
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.