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Biodiversity (GCSE Biology)

The following is a GCSE Biology test covering 'Biodiversity' from the broader topic Ecology. The test is geared towards the AQA exam board style syllabus.
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Which of the following is a biotic factor affecting a population?
Approximately what percentage of energy is passed from one trophic (feeding) level to the next in a typical ecosystem?
Which of the following human activities can cause eutrophication in rivers and lakes?
What does the term "species richness" mean?
Which practice is an example of active conservation to protect biodiversity?
What is an indicator species?
When measuring biodiversity, which two components are commonly used together?
What effect does habitat restoration (e.g., replanting native vegetation) usually have on biodiversity over time?
In a food web, which term describes organisms that make their own food by photosynthesis?
Which statement about pollinators and biodiversity is correct?
Which factor would most likely decrease biodiversity in a freshwater pond?