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Food chains

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Food chains & Food webs Primary producers They use sunlight, water and energy to make energy (their food). Without primary producers, there would be no life on this ... – PowerPoint PPT presentation

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Title: Food chains


1
Food chains Food webs
2
Primary producers
  • They use sunlight, water and energy to make
    energy (their food).
  • Without primary producers, there would be no life
    on this planet
  • Ex. Plants and Algae

3
Primary producers
4
Consumers
  • Organisms that do not make their own food
  • They need primary producers to live
  • Ex. Rabbits, Deer

5
Consumers
6
Types of Consumers
  • 1. Scavengers feed on the tissue of dead
    organisms (both plants and animals)
  • Ex. Vultures, Crows

7
Consumers
  • 2. Herbivores eat ONLY plants
  • Ex. Cows, Elephants, Giraffes

8
Consumers
  • 3. Carnivores eat ONLY meat
  • Ex. Lions, Tigers, Sharks

9
Consumers
  • 4. Omnivores eat BOTH plants and animals
  • Ex. Bears and Humans

10
Decomposers
  • They break down dead plant or animal material
    into simple nutrients
  • Ex. Bacteria and Mushrooms

11
Transfer of Energy
  • When a zebra eats the grass, it does not obtain
    all of the energy the grass has (much of it is
    not eaten)
  • When a lion eats a zebra, it does not get all of
    the energy from the zebra (much of it is lost as
    heat)

12
Transfer of Energy
  • The two (2) previous examples of energy transfer
    show that no organism EVER receives all of the
    energy from the organism they just ate
  • Only 10 of the energy from one trophic level is
    transferred to the next this is called the 10
    law

13
Trophic Levels
  • Energy moves from one organisms to another when
    it is eaten
  • Each step in this transfer of energy is know as a
    trophic level
  • The main trophic levels are producers, consumers,
    and decomposers

14
Food Chains
  • The energy flow from one trophic level to the
    other is known as a food chain
  • A food chain is simple and direct
  • It involves one organism at each energy level
  • Primary Consumers eat primary producers
  • Secondary Consumers eat the primary consumers
  • Tertiary Consumers eat the secondary consumers
  • Decomposers bacteria and fungi that break down
    dead organisms and recycle the material back into
    the environment

15
Food Chain
16
Food Web
  • Most organisms eat more than JUST one organism
  • When more organism are involved it is known as a
    FOOD WEB
  • Food webs are more complex and involve lots of
    organisms

17
Name all individual food chains in this food web.
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