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Trophic Levels (biology Only) (GCSE Biology)

The following is a GCSE Biology test covering 'Trophic Levels (biology Only)' from the broader topic Ecology. The test is geared towards the AQA exam board style syllabus.
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Which of the following best describes why longer food chains are less common?
Which of these best describes a food web?
Which statement about omnivores is correct?
Why are decomposers essential for nutrient cycling?
A fisherman catches many large tuna (top predators). Which effect is most likely if the tuna population is drastically reduced?
Which factor would most directly increase primary productivity in an ecosystem?
Which process causes the most energy loss between trophic levels?
In a simple grass ? rabbit ? fox food chain, what is the rabbit classified as?
What term describes an organism that eats only plants?
Why is energy lost between trophic levels?
Approximately what percentage of energy is typically transferred from one trophic level to the next?