Starter; Write down as many food chains as you can from this food web.

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Presentation transcript:

Starter; Write down as many food chains as you can from this food web. sparrowhawk owl robin stoat earthworm mouse rabbit leaves and berries dandelion

Starter; Write down as many food chains as you can from this food web. sparrowhawk owl robin stoat earthworm mouse rabbit leaves and berries dandelion (How many carnivores are in the food web? How many herbivores? Name them.)

Starter; Write down as many food chains as you can from this food web. sparrowhawk owl robin stoat earthworm mouse rabbit leaves and berries dandelion

Starter; Write down as many food chains as you can from this food web. sparrowhawk robin earthworm leaves and berries

Today’s learning objectives! Name a pesticide which will not break down in the environment. Describe how pesticides can kill other organisms. Explain advantages of using biological control over pesticides.

Toxic food chains What are pesticides used for? DDT, a useful pesticide, was found to have lots of toxic effects on the environment, especially birds. DDT is not easily broken down by the environment.

Bioaccumulation Each leaf receives one “dose” of DDT when sprayed. Each worm eats 3 leaves, and receives 3 doses of DDT. Each robin eats 2 worms. Each sparrowhawk eats 2 robins. How many doses of DDT does the sparrowhawk eat? If they eat enough DDT, birds lay eggs with very thin shells, which break before they are ready to hatch. How might this effect the sparrowhawk population, and the other members of the food chain?

Today’s learning objectives! Name a pesticide which will not break down in the environment. Describe how pesticides can kill other organisms. Explain advantages of using biological control over pesticides.

Today’s learning objectives! Name a pesticide which will not break down in the environment. Describe how pesticides can kill other organisms. Explain advantages of using biological control over pesticides.

What do you think these people are doing? Why?

Let’s play ... true or false

Pesticides reduce crop yield. False

Bioaccumulation is where the first organism to swallow pesticide is the most damaged. False 18

Biological control agents are organisms released into a food web to control the amount of another species. True 19

Aphids are an example of a biological control agent. False 20

Poisons can be passed through food chains and get more concentrated at each step. True 21

Are green plants important? True 22

Do all living things die? True 23