Community level systems

OCR GCSE Combined ScienceTopic 4 of 186 lessons

Revision notes for Community level systems in OCR Combined Science A (J250). Every lesson in BrainCake comes with R.E.C.I.P.E. recall steps, a quick check and spaced reviews.

1. Cycling of materials in an ecosystemMaterials needed by living things are not used up.
2. Microorganisms and decompositionWhen plants and animals die, and when animals produce waste such as faeces, the materials in them are not lost.
3. The carbon cycle and the water cycleThe carbon cycle shows how carbon moves around.
4. Levels of organisation in an ecosystemEcology can be studied at different levels, from a single living thing up to a whole habitat and the environment around it.
5. Abiotic and biotic factors affecting communitiesThe size and make-up of a community depends on abiotic factors (non-living) and biotic factors (living).
6. Interdependence and competitionIn a community, organisms depend on each other for food, shelter, pollination and seed dispersal.

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