Topic 5.1: Communities & Ecosystems

5.1 Communities and ecosystems

5.1.1

Define species, habitat, population, community, ecosystem and ecology.

5.1.2

Distinguish between autotroph and heterotroph.

5.1.3

Distinguish between consumers, detritivores and saprotrophs.

5.1.4

Describe what is meant by a food chain, giving three examples, each with at least three linkages (four organisms).

5.1.5

Describe what is meant by a food web.

5.1.6

Define trophic level.

5.1.7

Deduce the trophic level of organisms in a food chain and a food web.

5.1.8

Construct a food web containing up to 10 organisms, using appropriate information.

5.1.9

State that light is the initial energy source for almost all communities.

5.1.10

Explain the energy flow in a food chain.

5.1.11

State that energy transformations are never 100% efficient.

5.1.12

Explain reasons for the shape of pyramids of energy.

5.1.13

Explain that energy enters and leaves ecosystems, but nutrients must be recycled.

5.1.14

State that saprotrophic bacteria and fungi (decomposers) recycle nutrients.

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