Which of the following statements about ecosystems is not true?
An ecosystem includes both the living (biotic) community and the non-living (abiotic) environment.
Ecosystems are closed systems where energy cannot enter or leave.
Energy flows unidirectionally through an ecosystem, while nutrients are cycled within it.
An ecosystem can be of any size, from a small puddle to a large tropical rainforest.
37 exam-style questions on OCR A A Level Biology Ecosystems. Each one has a worked solution and a mark scheme showing where the marks go.