Biology, B2

Unit 2 Flashcards for year 11 exams

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Ecosystems

All living things and their surrounding make up an ecosystem.

Many ecosystems are still unexplored and could contain new species.

Artificial Ecosystems - usually controlled using pesticides(control pests), herbicides (remove weeds) and fertilisers(increase crop yield)

Keys-can be used to identify the animals and plants in a habitat

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Counting animals

Different counting methods are used to estimate populations.estimates are often inaccurate if the sample size is not large enough. To increase accuracy- repeat the process, make the sample size as large as possible.

Quadrats- method of this. place on ground in a random way (fairness). Percentage cover of each plant is recorded.

pop formula - no of animals 1st x no of animals 2nd

no of marked animals 2nd

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