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GCSE Biology Food chains webs and pyramids
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STARTER
Create 3 food chains
Grass Rabbit Foxe.g
Remember to start with a plant
Algae grass blackberries nettles lettuce
rabbit cow blackbird butterfly small fish
Human fox shark frog hawk
You can use the following organisms or any of your own
Learning Outcomes
Food chain and webs
ALL Construct food chains, food webs and food pyramids
MOST Interpret energy diagrams
SOME Evaluate the pro’s and con’s of intensive farming and free range farming
FOOD CHAINS & WEBSWatch the animation on food chainsThere are 12 Food chains in this food web. Try to find all 12
Pyramid of numbers
Pyramid of numbers Pyramid of biomass
Mass of 1 Owl = 5kg
Mass of 5 voles = 10kg
Mass of 1000 grass plants = 50kg
Pyramid of biomass
Pyramid of numbers Pyramid of biomass
Mass of 1 sparrowhawk = 5kg
Mass of 5 bluetits = 10kg
Mass of 1000 caterpillars = 20kg
Mass of one tree = 1000kg
Pyramid of biomass
All energy comes from the sunAs energy passes through the food chain some of it makes the biomass
Some of it is loss through
Respiration, heat, reproduction and faeces
Energy flow
Intensive farming V Free range
HSW
Create an argument either FOR intensive farming or FOR free range farming
Use Science, Biology Page 172/3.
Meet Susie……she has a dream!
Learning Outcomes
Food chain and webs
ALL Construct food chains, food webs and food pyramids
MOST Interpret energy diagrams
SOME Evaluate the pro’s and con’s of intensive farming and free range farming
Plenary
COMPLETE EXAM QUESTIONS