B7 Ecosystems

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  • Created by: abena
  • Created on: 07-05-13 16:16
What happens in a perfect closed loop system?
All outputs from processes or stores within the systems are recycled and used as inputs to other processes or stores.
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Why is there no waste in a perfect closed loop system?
Because everything is recycled-there is no outputs from a perfect closed loop system and there are no inputs to it.
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Why are ecosystems a type of closed loop system?
Because most of the waste (outputs) produced by organisms isn’t lost. It is recycled as food or reactants for other organisms in the system
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Give four examples of waste products in a natural ecosystem?
Oxygen, carbon dioxide, dead organic matter and mineral nutrients
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How are the waste products in a natural ecosystem reused?
O2-used as reactant during respiration(plants and animals). Co2- used as reactant during photosynthesis/mineral nutrients absorbed(plants). Dead organic matter-used as food(microorganisms)
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Give two examples on how human activities damage ecosystems?
Farmers use fertilisers-extra nutrients- makes ecosystem unbalanced. Inputs of nutrients higher than normal, leads to eutrophication. Humans create non-recyclable waste that can’t be used again-waste builds to harmful levels in an ecosystem.
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Give three reasons why using fossil fuels mean that human systems aren’t closed looped?
Produces waste emission that can’t be used again in system. When fossil fuels are used it inputs energy into the system from outside the system (fossil sunlight energy).Fossil fuels takes millions of years to form- cant be made within system again.
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Other cards in this set

Card 2

Front

Why is there no waste in a perfect closed loop system?

Back

Because everything is recycled-there is no outputs from a perfect closed loop system and there are no inputs to it.

Card 3

Front

Why are ecosystems a type of closed loop system?

Back

Preview of the front of card 3

Card 4

Front

Give four examples of waste products in a natural ecosystem?

Back

Preview of the front of card 4

Card 5

Front

How are the waste products in a natural ecosystem reused?

Back

Preview of the front of card 5
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