b4 e-h pig. what’s wrong with this food chain? arrows pointing wrong way
TRANSCRIPT
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B4 e-h Pig
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• Arrows pointing wrong way
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• How do you work out biomass?
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• Number of organisms x average (dry) mass
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• List 2 ways energy is lost as you move up a food chain
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• Some parts don’t get eaten
• Some lost as faeces
• Some used in respiration (movement, keeping warm etc)
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• Why can farmers make more money by keeping battery hens in cages than they can from free range?
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• Less energy is lost in moving and keeping warm so farmers can feed them less
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• Name 2 biofuels
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• Biogas (methane)
• Bioethanol
• Wood
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• How do you make biogas?
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• Fermentation• By bacteria• In a digester
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• Why do farmers use pesticides?
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• So pests don’t eat crops• (Less of the crop’s energy is lost to pests is a
better answer)
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• What is biological control?
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• A natural predator eats the pest
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• What are the advantages of biological control?
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• No toxic chemical• Useful insects not
harmed• Top predators not
poisoned
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• What 3 conditions do decomposers need to grow?
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• Oxygen
• Water
• Warmth
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• Why does adding sugar or salt preserve food?
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• Removes water using osmosis
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• Name 2 uses of decomposing microbes?
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• Making compost• Breaking down
sewage
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• How does carbon get into plants?
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• Photosynthesis
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• List 3 ways carbon is put back into the atmosphere?
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• Respiration by animals
• Respiration by plants• Respiration by
decomposers (decomposition)
• Combustion
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• Why is there more carbon dioxide in the atmosphere in the winter?
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• Less photosynthesis (fewer leaves)
• More combustion (heating)
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• What other element is recycled in nature?
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• nitrogen