B7 Learning from ecosystems

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  • Created by: Jess
  • Created on: 16-06-13 16:59
What is a closed loop system?
A closed loop system is where the waste materials from one part of the ecosystem are used as foods or reactants by another part
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What are natural waste products in an ecosystem?
Oxygen from photosynthesis; carbon dioxide from respiration; dead matter of living things e.g. sperm, fallen leaves, petals, fruit
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Why are natural ecosystems important to humans?
They provide food e.g. game animals, fish; clean air and oxygen from actions of plants and microorganisms; clean water
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What are examples of human input into natural ecosystems?
fertilisers that wash in waters, leading to the water becoming unable to support life; burning fossil fuels which increases climate change; domestic and industrial waste, releases chemicals into the ecosystem that can be harmful
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What are examples of human output into natural ecosystems?
Removal of non-recycled waste; timber harvesting; fishing; agriculture
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What can removing vegetable from the eco-system cause?
Soil erosion; loss of biodiversity; build-up of carbon dioxide; changes in weather
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How can soil erosion cause desertification?
natural vegetation binds the soil and foliage protects from direct rainfall, without these the soil can be washed away which leads to desertification
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What are the steps in eutrophication?
1)nitrates from fertilisers leach into water 2) as algae die the microorganisms of decay use up oxygen in the water in respiration 3) reduction of oxygen levels cause larger organisms to die 4)the process leads to oxygen levels so low there's no life
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How does bio-accumulation occur?
1)Small amounts of toxic waste may taken up by plants & stored in their roots/leaves/fruit 2) animals eat the plant, if they eat a lot of plants the amount of chemical stored in their bodies is higher than a single plant 3) toxicity increases
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Card 2

Front

What are natural waste products in an ecosystem?

Back

Oxygen from photosynthesis; carbon dioxide from respiration; dead matter of living things e.g. sperm, fallen leaves, petals, fruit

Card 3

Front

Why are natural ecosystems important to humans?

Back

Preview of the front of card 3

Card 4

Front

What are examples of human input into natural ecosystems?

Back

Preview of the front of card 4

Card 5

Front

What are examples of human output into natural ecosystems?

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