further biology unit 7

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What is bioaccumulation?
It is where a certain toxic substance, such as a pesticide, accumulates and keeps on accumulating in living organisms, posing a threat to health life and the environment.
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What is eutrophication?
It is when an over use of fertiliser is used on fields resulting them being washed off the land into rivers and lakes.
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How does vegetation reduce soil erosion?
Foliage protects the soil form direct rainfall and the roots help to bind the soil together.
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What do ecosystems provide humans with?
Ecosystems provide us with clean air, water, food such as fish and game, soil, mineral nutrients and pollination.
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Why are human systems not closed-loop systems?
Because some waste leaves the system such as non-recycled waste from households, agriculture and industry, and emissions form fossil fuels.
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Why can human activity unbalance natural ecosystems?
Humans can unbalance them by altering the inputs and outputs leading to a change.
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When is the use of natural resources for humans sustainable?
If it is used at a rate which it can be replaced.
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Other cards in this set

Card 2

Front

What is eutrophication?

Back

It is when an over use of fertiliser is used on fields resulting them being washed off the land into rivers and lakes.

Card 3

Front

How does vegetation reduce soil erosion?

Back

Preview of the front of card 3

Card 4

Front

What do ecosystems provide humans with?

Back

Preview of the front of card 4

Card 5

Front

Why are human systems not closed-loop systems?

Back

Preview of the front of card 5
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