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Pyramids Of Biomass (biology Only) (GCSE Biology)

The following is a GCSE Biology test covering 'Pyramids Of Biomass (biology Only)' from the broader topic Ecology. The test is geared towards the AQA exam board style syllabus.
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When constructing a pyramid of biomass for a forest, why is it important to sample a representative area?
Which statement about the efficiency of biomass transfer is correct?
What measurement would give the most accurate estimate of the living organic matter in a trophic level?
Which trophic level would you expect to have the smallest total biomass in most ecosystems?
Which process primarily causes biomass to decrease between trophic levels?
How can harvesting of primary producers (e.g., cutting grass for silage) change the pyramid of biomass on a farm?
If a producer level has 1000 g/m2 of biomass and the next consumer level has 100 g/m2, what is the approximate transfer efficiency between these levels?
Which method is least appropriate for constructing a pyramid of biomass for aquatic phytoplankton?
Which of the following best describes the relationship between energy and biomass in a food chain?
Which best explains why energy pyramids and biomass pyramids are related but not identical?
Why are pyramids of biomass usually measured using dry mass rather than wet mass?