Sheep and deer graze on the same upland grassland. Both populations feed on the grass.
Which change would increase competition between the sheep and deer?
A drought reduces the growth of the grass.
Half of the sheep are moved to another field.
The deer start to eat tree leaves as well as grass.
A disease kills many of the deer.
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.