A2 Biology (OCR) - Ecosystems

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Key Words (as defined by OCR in the A2 textbook glossary)

Ecosystem - All the living organisms and all the non-living components in a specific habitat, and their interactions.

Ecosystems can be on a large scale (such as the sea, or the savannah), or on a small scale (such as a pond or a single tree)

Habitat - The place where an organism or population of organisms lives.

Population - All of the organisms of one species, who live in the same place at the same time, and who can breed together.

Community - All the populations of different species that live in the same place at the same time, and can interact with each other.

Niche - the role that a species plays in an ecosystem

Each organism interacts with both living and


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