Draw a food chain to represent the following organisms Grass Rabbit Fox

Pyramids of Biomass All – understand and draw food chains Most – draw and interpret pyramids of biomass Some –analyse pyramids of biomass in terms of energy loss

Food Chains... show which organisms eat other organisms. GrassRabbitFox The arrows show the transfer of energy from one organism to the next...

‘Producer’ Makes its own food using the energy from sunlight, increasing its own biomass.

Numbers or biomass?

Pyramids of numbers only give an accurate impression of the flow of energy in a food chain if the organisms are of similar size. Measuring the biomass at each trophic level can give a more accurate picture. Pyramids of numbers are a quantitative way of representing food chains. What are the problems of representing food chains in pyramids of numbers? They record the number of organisms at each trophic level in a specified area. What are pyramids of numbers?

Draw a pyramid of biomass to represent the following organisms Grass Rabbit Fox

Pyramid of biomass (amount of material):  Energy is reduced at each level so is always a pyramid shape Carrots Rabbits Fox WHY? Respiration Heat loss Moving Faeces Not all material consumed

Draw a pyramid of biomass to represent the following organisms Grass Rabbit Fox If you can… Why in terms of energy does the mass decrease along the food chain? Where does the energy go?

Pyramids of Biomass All – understand and draw food chains Most – draw and interpret pyramids of biomass Some –analyse pyramids of biomass in terms of energy loss

You are to write a section for a revision guide on ‘Pyramids of Biomass’ It should be -short (half a page or less) -clear and correct -include diagrams