A2 OCR Biology Key Terms and Definitions Ecosystems

1. A directional change in a community over time. (10)
6. A place where a population of organisms live. (7)
7. The jumble of rocks left behind by a retreating glacier. (7)
8. A carnivore that feeds on a secondary consumer. (8, 8)
9. The total energy put into a system divided by the useful energy obtained; it is often multiplied by 100 and stated as a percentage. (10)

2. Number of different species that live together in the same area. (9)
3. An organism that transfers energy from light or an inorganic compound to organic compounds; plants are producers, using light energy to produce carbohydrates and other organic substances. (8)
4. An organism that obtains its energy from organic compounds such as carbohydrates, fats and proteins. (8)
5. A carnivore that feeds on herbivores. (9, 8)
10. Organisms that look similar and can interbreed to produce fertile offspring. (7)

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