What does biomass mean? 

Biomass refers to the mass of organic material that comes from living organisms, such as plants and animals.

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What is a pyramid of biomass?

A pyramid of biomass is a diagram that shows the biomass of each trophic level in a food chain. 

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Give 3 reasons why only ~10% of the energy & biomass is passed on at each stage in a food chain. 

  1. Organisms don't normally eat every part of their food (e.g. rabbits may not eat the roots of the grass they eat).
  2. Some of the material they eat may not be absorbed (e.g. rabbits may not be able to digest all the cellulose in the grass).
  3. Most of the biomass/energy absorbed is used to release energy (via respiration) for movement etc.

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