Two beetle species eat the same seeds. Spiders eat species P but do not eat species Q. Spiders are removed from enclosed plots while other conditions remain unchanged.
Which changes are most likely if seeds become limiting?
P decreases because of predation; Q decreases because of competition.
P increases because of reduced predation; Q decreases because of competition.
P decreases because of competition; Q increases because of reduced predation.
P increases because of competition; Q increases because of increased predation.
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.