A spreading ground-cover plant grows in two large courtyard beds. Individual plants overlap, so they cannot be counted separately. One bed is watered during dry weather and the other receives rainwater only.
Devise an investigation to compare the abundance of the ground-cover plant in the two beds.
82 exam-style questions on Edexcel GCSE Biology 9.1 Ecosystems and interdependence, covering 9.1.1 Levels of organisation in ecosystems, 9.1.2 Abiotic and biotic factors, 9.1.3 Importance of interdependence, 9.1.4 Parasitism and mutualism, and 9.1.5 Determining number of organisms in an area. Each one has a worked solution and a mark scheme showing where the marks go.