Scientists investigate factors that affect organisms in a coastal reedbed.
Which observation shows an effect of an abiotic factor?
host plants grow less when parasites remove their resources
plants grow less in areas where light intensity is low
seeds are carried away from parent plants by animals
flowering plants produce more seeds after insects transfer pollen
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.