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GCSE Biology · key term
An individual living thing.
Used by AQA and OCR
Specification 4.2.1, 4.7.1.1 · Paper 1, Paper 2
Revise: Organisational PrinciplesEvery living organism is made from cells. A cell is the basic building block of life: it is a small unit containing the structures needed to carry out living processes. Some organisms consist of just one cell.
A single living thing.
Use the precise hierarchy: cell → tissue → organ → organ system → organism.
In a question about competition, name the resource and explain why the organisms need it; use the habitat described rather than listing every possible resource.
Keep the same area in mind as you move through the levels: one rabbit is an organism; all the rabbits there are a population.
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Specification B4.1e · Paper 2 (Foundation), Paper 4 (Higher)
An individual living thing, such as one rabbit or one oak tree.
Revise: Levels of organisationStart with one living thing: a single rabbit in a meadow is an organism. The rabbit belongs to a species. All the rabbits living in that meadow at the same time form a population.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
One individual living thing, such as one oak tree, bacterium or fox.
Revise: Ecosystem OrganisationA population contains individual organisms, a community contains populations, and an ecosystem contains the community together with its non-living environment. These ecological levels should not be confused with levels inside a multicellular organism, such as cells, tissues and organs.