Food chains and food webs

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Food chains and food webs
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We Are Learning To

• use words correctly to describe feeding
  relationships between animals and plants.
• show how energy flows through food chains
• interlink food chains to form food webs

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What Im Looking For

1. Construct your own food chain
2. Spot at least two food chains from a food web
3. Point arrows in the right direction in a food
   chain
4. Construct a food web in a group
5. Be able to answer quiz at the end

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Trout
Kingfisher
Pondweed
Minnow (little fish)
Heron
Insect larvae
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Insect larvae
Minnow (little fish)
Kingfisher
Pondweed
http//www.riverlee.org.uk/science/scie-02/scie-02
a.htm
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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)
Kingfisher
Pondweed
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Energy Flow
Which way does the energy flow?

• Which way do the suns rays go?

What is it used for?
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How is the suns energy used?
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Plankton Algae
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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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Food chain a flow of energy in a habitat
Grass is eaten by Rabbits which are eaten
by Owls
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Food chain a flow of energy in a habitat
Grass is eaten by Rabbits which are eaten by Owls
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
Shrew
Owl
Rabbit
Grass
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Shrews also eat other plant matter as well as
Grass
Plant matter
Shrew
Owl
Rabbit
Grass
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Shrews also have to watch out for weasels that
might eat them
Weasel
Plant matter
Shrew
Owl
Rabbit
Grass
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And snails and worms eat the plant matter too.
Weasel
Shrew
Plant matter
Owl
Rabbit
Grass
Worm
Snail
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Food Chain to Food Web

• Lets complete ours with
• hedgehogs (that eat snails worms) and
• foxes (that eat pretty much anything that moves!)

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Weasel
Shrew
Plant matter
Owl
Rabbit
Grass
Worm
Snail
Hedgehog
Fox
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How many food chains are there now?
Weasel
Shrew
Plant matter
Owl
Rabbit
Grass
Worm
Snail
Hedgehog
Fox
Write down as many as you can in 3 minutes!
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Plant matter
Shrew
Weasel
Fox
Grass
Shrew
Weasel
Fox
Plant matter
Shrew
Owl
Owl
Shrew
Grass
Plant matter
Hedgehog
Fox
Worm
Plant matter
Hedgehog
Fox
Snail
Rabbit
Fox
Grass
Grass
Rabbit
Fox
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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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Some Key Words

• Producer
• Consumer
• Herbivore
• Carnivore
• Omnivore

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CARNIVORES
OMNIVORES
HERBIVORES
PRODUCERS
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Your turn

• In groups of four use the pictures in the
  envelopes 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!

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Oak Tree
Fox
Mouse
Squirrel
Kingfisher
Daffodil
Snail
Plankton
Well Done Everyone!
CARNIVORE
HERBIVORE
PRODUCER
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What We Have Done

1. Constructed food chains
2. Spotted at least two food chains from a food web
3. Point arrows in the right direction in a food
   chain
4. Constructed a food web in a group
5. Answered quiz at the end

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(No Transcript)
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PRODUCERS
HERBIVORES
CARNIVORES
Caterpillar Mouse Woodlouse
Oak Grass Small plants Dead material
Owl Snake
Woodland
Beetles Spiders Fish
Insect larvae Snail
Plankton Pondweed Dead material
Pond
Greenfly Woodlouse Small bird
Hawk Weasel
Hawthorn Dead material
Hedgerow