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7 Cards in this Set
- Front
- Back
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What do pyramids of biomass show? |
The dry mass of living material at each tropic level |
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Why may pyramids of biomass look different to pyramid of numbers? (2) |
-if producers are very large - if small parasites are living of large animals |
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Why are pyramids of biomass difficult to construct? (2) |
- so organism feed of different organisms on different tropic levels - it involves removing and organisms water (killing it) |
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As energy flows along a food chain, what is some energy transferred into? (3) |
- heat from respiration - egestion - excretion |
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Why is the energy lost at each food chain not wasted? |
Decomposes use it which can start another food chain |
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Why does the last animal in the food chain not get enough food? |
Because up to 90% of the food is lost at each tropic level |
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How can efficiency in food chains be calculated? |
Energy used for growth / energy input x 100% |
