B2 Flascards- Energy Flow

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  • Created by: Eleanor.1
  • Created 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
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What do pyramids of biomass show?
The dry mass of each organism at each stage of the food chain.
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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.
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Why is a pyramid of biomass difficult to construct?
Some organisms feed on organisms from different trophic levels.
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Why is a pyramid of biomass difficult to construct? 2
It involves removing all of the water from the organism, which will kill it.
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How is energy transferred into less useful forms?
Heat from repiration, egestion and excretion.
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What is the material lost at each of the stages used by?
Decomposers that can start another food chain.
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What happens to the animal at the end of a long food chain?
It doesn't have much food supplied to it.
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Why?
Because 90% of energy is lost at each stage of the food chain.
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How can the efficiency of energy be calculated between trophic levels?
energy used for growth÷energy input=20÷100 or 20%
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Other cards in this set

Card 2

Front

What do pyramids of biomass show?

Back

The dry mass of each organism at each stage of the food chain.

Card 3

Front

Why might they look different to a pyramid of numbers?

Back

Preview of the front of card 3

Card 4

Front

Why is a pyramid of biomass difficult to construct?

Back

Preview of the front of card 4

Card 5

Front

Why is a pyramid of biomass difficult to construct? 2

Back

Preview of the front of card 5
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