The dry mass of living material at each stage of the food chain
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A pyramid of numbers shows...
The number of organisms at that stage of the food chain
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Pyramids of biomass are harder to construct because...
1) Some organisms feed on organisms from different trophic levels 2) It is hard to measure dry mass as it involves removing all water from organism which would kill it
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As energy flows along the food chain, some is used in growth and some transferred into less useful forms like...
1) Heat from respiration 2) Egestion 3) Excretion
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Is the material lost at each stage of the food chain wasted?
No, most of the waste is used by decomposers that start another food chain
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Why does an animal at the end of a long food chain not have much food available to it?
Because 90% of the energy available is lost at each trophic level
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How do you calculate the efficiency of energy transfer?
Energy used for growth / Energy input
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Other cards in this set
Card 2
Front
The number of organisms at that stage of the food chain
Back
A pyramid of numbers shows...
Card 3
Front
1) Some organisms feed on organisms from different trophic levels 2) It is hard to measure dry mass as it involves removing all water from organism which would kill it
Back
Card 4
Front
1) Heat from respiration 2) Egestion 3) Excretion
Back
Card 5
Front
No, most of the waste is used by decomposers that start another food chain
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