Two groups of snails each eat the same dry biomass of cabbage leaves. Group P egests 20% of the food as faeces. Group Q egests 35% of the food as faeces. All other biomass losses are the same in both groups.
Which statement about the transfer of biomass from the cabbage leaves to the snails is correct?
Transfer is equally efficient in both groups because the snails eat the same biomass of food.
Transfer efficiency cannot be compared because the faeces may later be digested by decomposers.
Transfer is more efficient in group P because a smaller percentage of the food is egested.
Transfer is more efficient in group Q because more biomass passes from the snails to decomposers.
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.