Bird species P eats only caterpillars. Bird species Q eats caterpillars and beetles. Caterpillar numbers fall, but beetle numbers remain high.
Which prediction is best supported?
P is more affected because it has no alternative food in this example.
Q is more affected because it can feed on two different prey species.
P is less affected because it does not compete for any beetles.
Q is equally affected because all consumers need identical food supplies.
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.