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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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Below a typical questions that will be covered in this test. You final score will be logged on your account

Why is the “10% rule” (about 10% energy transfer between trophic levels) only an approximation?
How can harvesting of primary producers (e.g., cutting grass for silage) change the pyramid of biomass on a farm?
Which method is least appropriate for constructing a pyramid of biomass for aquatic phytoplankton?
In a typical food chain, which trophic level forms the base of a pyramid of biomass?
What is the usual unit for expressing the mass in a pyramid of biomass for a given area?
Which real-world factor can make comparisons between pyramids of biomass from different habitats difficult?
When ecologists compare pyramids of biomass across different ecosystems, what valuable conclusion can they most reliably draw?
What does an inverted pyramid of biomass indicate in an ecosystem?
A scientist measured biomass at one time in a rapidly reproducing producer population (e.g., algae) and found a small producer biomass but large consumer biomass. What is the most likely explanation?
What measurement would give the most accurate estimate of the living organic matter in a trophic level?
Which statement about the efficiency of biomass transfer is correct?