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7C - Ecology Matters Food Chains and Food Webs
7-Dec-18 7C - Ecology Matters Food Chains and Food Webs To start with… Have a go at the exam question on adaptations Bring it to me for marking when you have done. Where does all the energy in an ecosystem come from? How do plants produce their own food?
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7C - Ecology Matters Food Chains and Food Webs
7-Dec-18 Objectives: using words correctly to describe feeding relationships between animals and plants, showing how energy flows through food chains and interlinking food chains to form food webs Keywords: Vitamins Minerals Carbohydrates Proteins Fats Deficiency Unbalanced Digestion Grade F Construct your own food chain. Grade E Identify at least two food chains from a food web. Grade D Describe how to arrange the arrows in a food chain. Grade C Explain why the arrows have to point a certain way in a food chain. Grade B Create a food web by linking lots of food chains together. SBD BBG Year 8
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Trout Kingfisher Pondweed Minnow (little fish) Heron Insect larvae
Use large pictures and get students to come up to the front. Draw big black arrows on A4 and discuss the implausibility of a minnow eating a kingfisher. Minnow (little fish) Heron Insect larvae
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Insect larvae Minnow (little fish) Pondweed Kingfisher
e.g.
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Your turn In pairs write down two food chains.
Perhaps one of the organisms in it could be you! (Hopefully not being eaten by a wolf ) Draw in arrows pointing from the thing being eaten to the thing eating it. Insect larvae Minnow (little fish) Pondweed Kingfisher
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Energy Flow Which way does the energy flow?
Which way do the sun’s rays go? Sun: Earth: What is it used for?
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How is the sun’s energy used?
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Plankton & Algae
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Sun allows grass to grow Grass is eaten by Rabbits which are eaten by
Food chain: a flow of energy in a habitat Sun allows grass to grow Grass is eaten by Rabbits which are eaten by Owls
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Rabbits which are eaten by Owls
Food chain: a flow of energy in a habitat Grass is eaten by Rabbits which are eaten by Owls Not sure about the font colours, but they link in with the rest of the upcoming slides so I didn’t want to change them!
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Rabbits which are eaten by Owls
Food chain: a flow of energy in a habitat Grass is eaten by Rabbits which are eaten by Owls Owl Grass Rabbit The arrow means ‘is eaten by’ and always goes towards the consumer
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Except that Owls also eat Shrews as well as Rabbits
Grass Rabbit
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Shrews also eat other plant matter as well as Grass
Owl Rabbit Grass
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Shrews also have to watch out for weasels that might eat them
Plant matter Shrew Owl Rabbit Grass
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And snails and worms eat the plant matter too.
Weasel Plant matter Shrew Owl Rabbit Grass Worm Snail
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Weasel Plant matter Shrew Owl Rabbit Grass Worm Snail Hedgehog Fox
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How many food chains are there now?
Weasel Plant matter Shrew Owl Rabbit Grass Worm Snail Hedgehog Fox Write down as many as you can in 3 minutes!
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Shrew Weasel Fox Grass Shrew Weasel Fox Shrew Owl Shrew Owl Grass
Plant matter Shrew Weasel Fox Grass Shrew Weasel Fox Plant matter Shrew Owl Shrew Owl Grass Plant matter Hedgehog Fox Worm Plant matter Hedgehog Fox Snail Rabbit Fox Grass Grass Rabbit Owl
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Food Chain to Food Web The original food chain has expanded into a food web with 8 interlinked chains as more organisms have been added Food webs are normal in natural habitats as there is nearly always more than one organism that eats something else.
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Your turn In groups of four use the pictures to make your own food webs. Start off with individual food chains Then try to link them together to make a food web. Draw in some arrows – the right way round! Envelope pictures from
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Oak Grass Small plants Dead material Caterpillar Mouse Woodlouse Owl
PRODUCERS HERBIVORES CARNIVORES Oak Grass Small plants Dead material Caterpillar Mouse Woodlouse Owl Snake Woodland Beetles Spiders Fish Plankton Pondweed Dead material Insect larvae Snail Pond Hawthorn Dead material Greenfly Woodlouse Small bird Hawk Weasel Hedgerow
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