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B4 e-h Pig
What’s wrong with this food chain?
Arrows pointing wrong way
How do you work out biomass?
Number of organisms x average (dry) mass
List 2 ways energy is lost as you move up a food chain
Some parts don’t get eaten Some lost as faeces Some used in respiration (movement, keeping warm etc)
Why can farmers make more money by keeping battery hens in cages than they can from free range?
Less energy is lost in moving and keeping warm so farmers can feed them less
Name 2 biofuels
Biogas (methane) Bioethanol Wood
How do you make biogas?
Fermentation By bacteria In a digester
Why do farmers use pesticides?
So pests don’t eat crops (Less of the crop’s energy is lost to pests is a better answer)
What is biological control?
A natural predator eats the pest
What are the advantages of biological control?
No toxic chemical Useful insects not harmed Top predators not poisoned
What 3 conditions do decomposers need to grow?
Oxygen Water Warmth
Why does adding sugar or salt preserve food?
Removes water using osmosis
Name 2 uses of decomposing microbes?
Making compost Breaking down sewage
How does carbon get into plants?
List 3 ways carbon is put back into the atmosphere?
Respiration by animals Respiration by plants Respiration by decomposers (decomposition) Combustion
Why is there more carbon dioxide in the atmosphere in the winter?
Less photosynthesis (fewer leaves) More combustion (heating)
What other element is recycled in nature?
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1 of 46© Boardworks Ltd of 46© Boardworks Ltd 2007.
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