13.1- Food chains and energy transfer

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  • Created by: Megan2413
  • Created on: 19-06-17 21:18
What is a producer?
An organism that synthesises organic molecules from simple inorganic ones such as CO2 and H2O
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Which trophic level do producers form?
First trophic level
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What is a common feature of producers?
They are generally photosynthetic
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What is a consumer?
Any organism that obtains energy by eating another organism
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What are the first three consumers called?
Primary, secondary and tertiary
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What are saprobionts?
A group of decomposers that break down complex molecules in dead/waster material
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What is released when saprobionts decompose?
Valuable minerals and elements in a form that can be absorbed from plants
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What describes a feeding relationship?
Food chain
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What is each stage in a food chain called?
Trophic level
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What do the arrows in a food chain represent?
The direction of energy flow and matter
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What do food chains always start with?
Photosynthetic producers
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What is a food web?
Many food chains linked up due to predators having various prey
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What is the total mass of living material in a specific area at a given time referred to as?
Biomass
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Why may some biomass measurements be inaccurate?
If biomass is being measured by the fresh mass minus the water mass, water mass can vary in living organisms at given times
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Why may biomass measurements be unethical?
Because in order to calculate the dry mass a organism may have to be killed
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Why may the data on biomass not be representative if the animals are to be killed in the method?
If animals are going to be killed, a smaller sample would be used to reduce the number of animals being killed- the sample may not be large enough to be representative
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What are the units of biomass when calculating in a given area of land?
g m-1
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What are the units of biomass when calculating in a given volume of water?
g m-3
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What is calorimetry?
A method by which the chemical energy store in dry mass can be estimated
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Describe the process of bomb calorimetry
A sample of dry mass is weighed and then nt in pure oxygen in a sealed container (bomb), which is surrounded by a water bath.The temperature rise of the water is measured so that the energy released from the burnt biomass can be calculated
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Which trophic level do producers form?

Back

First trophic level

Card 3

Front

What is a common feature of producers?

Back

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Card 4

Front

What is a consumer?

Back

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Card 5

Front

What are the first three consumers called?

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