Food chains and cycles
Biomass means the mass of living material at a stage in a food chain. The biomass goes down as you go from one stage to the next, just like the amount of energy.
A pyramid of biomasspyramid of biomass: a diagram to illustrate the amount of biological material within a food chain or web is a chart, drawn to scale, showing the biomass at each stage in a food chain. The bars become narrower as you reach the top. This pyramid of biomass is for the food chain:
oak tree → caterpillar → blue tit → sparrowhawk
Note that you do not need to draw the organisms. But you must draw your pyramid of biomass to scale. Each bar should be labelled with the name of the organism.