A pond contains frogs, pondweed, water snails and many other organisms.
Put these levels of organisation in order, starting with the smallest: community, ecosystem, individual, population
State what is meant by a community.
State what is meant by an ecosystem.
Give two abiotic factors that could affect the community in the pond.
Give one biotic factor that could affect the number of water snails in the pond.
39 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.