B2 Flascards- Energy Flow 0.0 / 5 ? BiologyEnergy flow through ecosystemsGCSEOCR Created by: Eleanor.1Created on: 07-05-14 17:00 What can both pyramids of numbers and pyramids of biomass represent? They represent feeding relationships between organisms in a food chain or web 1 of 10 What do pyramids of biomass show? The dry mass of each organism at each stage of the food chain. 2 of 10 Why might they look different to a pyramid of numbers? If the producers are large or if a small parasite lives on a large animal. 3 of 10 Why is a pyramid of biomass difficult to construct? Some organisms feed on organisms from different trophic levels. 4 of 10 Why is a pyramid of biomass difficult to construct? 2 It involves removing all of the water from the organism, which will kill it. 5 of 10 How is energy transferred into less useful forms? Heat from repiration, egestion and excretion. 6 of 10 What is the material lost at each of the stages used by? Decomposers that can start another food chain. 7 of 10 What happens to the animal at the end of a long food chain? It doesn't have much food supplied to it. 8 of 10 Why? Because 90% of energy is lost at each stage of the food chain. 9 of 10 How can the efficiency of energy be calculated between trophic levels? energy used for growth÷energy input=20÷100 or 20% 10 of 10
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