| Method |
Precise Learning Objective |
Linked |
Question / Activity
(Designed for maximum working out) |
Stepping Stones |
Pitstop Check
(Thinking Map) |
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Pyramids of biomass can be constructed to represent the relative amount of biomass in each level of a food chain. Trophic level 1 is at the bottom of the pyramid |
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What do pyramids of biomass represent and where can trophic level 1 be found? |
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Students should be able to construct accurate pyramids of biomass from appropriate data. |
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Students should be able to describe pyramids of biomass |
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What is the shape of a pyramid of biomass? |
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Students should be able to explain how biomass is lost between the different trophic levels |
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How is biomass lost between different trophic levels? |
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Producers are mostly plants and algae which transfer about 1 % of the incident energy from light for photosynthesis. |
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Name examples of producers. |
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Only approximately 10 % of the biomass is transferred up each trophic level. |
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What % of biomass is transferred up each trophic level? |
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Losses of biomass are due to:
? not all the ingested material is absorbed, some is egested as faeces
? some absorbed material is lost as waste, such as carbon dioxide and water in respiration and water and urea in urine. |
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What are losses of biomass due to? |
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Large amounts of glucose are used in respiration. |
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What is used in respiration? |
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(MS) Calculate the efficiency of biomass transfer between trophic levels. |
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If the producer trophic level has 4200J of energy and the primary consumer has 800J what is the efficiency of transfer between these trophic levels? |
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Students should be able to calculate the efficiency of biomass transfers between trophic levels by percentages or fractions of mass. |
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How can the efficiency of biomass transfers between trophic levels be calculated? |
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Students should be able to explain how this affects the number of organisms at each trophic level |
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How does lost biomass affect the amount of organisms at each trophic level? |
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