biology unit 3 topic 4

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Humans pollute:
waterways -with sewage, fertiliser and toxic chemicals. Air- with smoke and gases e.g sulphur dioxide which contributes to acid rain. Land- with toxic chemicals such as pesticides and herbicides which can be washed into the water
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Deforestation
occurred so crops can be grown, increase in cattle + rice fields. Has increased levels of CO2 in atmosphere and reducing biodiversity.
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Destruction of peat bogs
releases ‘locked up’ CO2 into atmosphere. Peat is removed from bogs as high in nutrients so good for compost. Using peat –free composts helps to preserve
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CO2
we can say that CO2 is sequestered by plants and water (plants take in by photosynthesis and it dissolves in oceans, lakes etc).
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An increase in the earths temp changing may:
cause changes to climate, rising sea levels, reduce biodiversity, change migration patterns e.g. – birds, change the distribution of species.
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Ethanol based biofuels
Can be produced by fermentation, microorganisms respire anaerobically to produce the ethanol, using sugars from crops as an energy source. Described as carbon neutral
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Biogas
– produced by anaerobic fermentation of bacteria. Plant and animal waste put into biogas generators. These provide ideal conditions for bacteria to reproduce and ferment.
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. Must be at suitable temps and oxygen free conditions. Generators usually buried underground for insulation. By-product – slurry can be used as fertiliser.
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Food production & efficiency
the shorter the food chain the less energy will be wasted. More efficient for us to eat plants. Can produce meat more efficiently by: preventing movement of animal, keeping in warm conditions.
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Fusarium
Is a fungus, used to produce mycoprotein, a protein rich food suitable for vegetarians. Grown aerobically on cheap sugar syrup. Grown in industrial fermenters – large vessels with air supply, stirrers to spread out microorganisms & temp + pH sensors
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Other cards in this set

Card 2

Front

occurred so crops can be grown, increase in cattle + rice fields. Has increased levels of CO2 in atmosphere and reducing biodiversity.

Back

Deforestation

Card 3

Front

releases ‘locked up’ CO2 into atmosphere. Peat is removed from bogs as high in nutrients so good for compost. Using peat –free composts helps to preserve

Back

Preview of the back of card 3

Card 4

Front

we can say that CO2 is sequestered by plants and water (plants take in by photosynthesis and it dissolves in oceans, lakes etc).

Back

Preview of the back of card 4

Card 5

Front

cause changes to climate, rising sea levels, reduce biodiversity, change migration patterns e.g. – birds, change the distribution of species.

Back

Preview of the back of card 5
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