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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 statement about a keystone species is correct?
Approximately what percentage of energy is transferred from one trophic level to the next in most ecosystems?
What is a food web?
What is meant by the carrying capacity of a habitat?
Which factor is most likely to cause a rapid decline in a prey population?
Which practice would best conserve biodiversity on farmland?
Which action would most directly increase carbon storage in an area and help mitigate climate change?
Which sampling method is best for estimating the abundance of small plants in a meadow?
In a food chain, which group are primary consumers?
Which organism is best described as a decomposer?
In primary succession, what is the first colonising organisms on bare rock typically called?