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How Materials Are Cycled (GCSE Biology)

The following is a GCSE Biology test covering 'How Materials Are Cycled' from the broader topic Ecology. The test is geared towards the AQA exam board style syllabus.
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What is the primary reason that wetlands are important in nutrient cycling and water quality?
Why is preserving biodiversity important for ecosystem nutrient cycling?
What is the main reservoir (largest store) of carbon on Earth on a long timescale?
Which of the following best describes nitrification?
What is ammonification (also called mineralisation) in the nitrogen cycle?
Which process converts atmospheric nitrogen (N2) into forms plants can use (e.g., ammonia)?
Which process removes carbon dioxide from the atmosphere and stores it in plant biomass?
Which process releases nitrogen gas back into the atmosphere from soil nitrate?
What is biological magnification (biomagnification)?
What is the most direct consequence of excessive nitrate in drinking water for humans?
Which method would best increase the rate of nutrient recycling on a farm?