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Communities (GCSE Biology)

The following is a GCSE Biology test covering 'Communities' from the broader topic Ecology. The test is geared towards the AQA exam board style syllabus.
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Which practice would best conserve biodiversity on farmland?
What is ecological succession?
Why are conservationists concerned about losing a species that is the only pollinator of a particular plant?
Which action would most directly reduce the negative impact of agriculture on local wildlife?
Which term describes two species living closely together where both benefit?
In a mark–release–recapture study, which assumption is important for estimating population size?
Which organism is best described as a decomposer?
In primary succession, what is the first colonising organisms on bare rock typically called?
What is an invasive (non-native) species likely to do in a new habitat?
When using a quadrat, what is the main purpose of repeating samples at random positions?
What does a pyramid of biomass represent?