GCSE Biology Food chains webs and pyramids

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