Divers surveyed a kelp bed off a rocky coast. They estimated that the kelp bed covered 1600 m2 and that, during one growing season, each square metre of kelp added 475 g of new biomass.
Calculate the mass of new kelp biomass produced by the whole bed during the growing season. Give your answer in kilograms.
Sea urchins graze on the kelp. Over the same growing season, the sea urchin population gains biomass equal to 6% of the new kelp biomass. Calculate the increase in sea urchin biomass.
103 exam-style questions on AQA GCSE Biology 7.4 Trophic levels in an ecosystem, covering 7.4.1 Trophic levels, 7.4.2 Pyramids of biomass, and 7.4.3 Transfer of biomass. Each one has a worked solution and a mark scheme showing where the marks go.