IB Biology HL C4.2.11 Energy Pyramids Topic Practice

pyramid of energy shows the flow of energy from one trophic level to the next (in a community);
units of pyramids of energy are energy per unit area per unit time $/ \mathrm{kJ} \mathrm{m}^{-2} \mathrm{yr}^{-1}$;
bar width is proportional to the energy stored (in the biomass) in that trophic level;
the first/lowest trophic level is producers;
second level is primary consumers/herbivores;
third level of secondary consumers/carnivores;
only a small amount (10 to 20 % ) of energy of one level is passed to the next;
bar width/energy stored in the trophic level decreases (proportionally) as you go up each level;
pyramid shows that there is a limit to the length of food chains;

Award any of the above marking points to a correctly drawn and clearly labelled pyramid.