Biology Further

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The human population is growing exponentially, which means what?
Raw materials used up quickly, more waste, pollution, less land (due to farming, quarrying, building, dumping waste).
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Waste by humans may pollute...?
Water- sewage, fertilisers, toxic chemials, Air- Smoke, gases, acid rain. Land- Pesticides/herbicides.
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Give to ways gases are released into the atmosphere?
1) Increase in cattle and rice fields (Methane). 2) Buring of wood and industrial burning (C02).
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A rise in the Earths temperature leads to...?
Significant climate change. Rise in sea levels. Reduced biodiversity. Change in migration patterns. Changes in distribution of species.
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Give examples of what land created by deforestation is used for?
Crops for biofuels based on ethanol. Cattle and rice fields to provide more food.
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Deforestation has...?
Increased the release of C02. Reduced the rate of photosynthesis removing C02 from atmosphere. increased the amount of methane.
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What does Biodiversity mean?
The range of species in a habitat.
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Why is it important to conserve Biodiversity?
Species maybe needed for future use.
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What is a Biofuel?
A fuel thats biological. It takes in as much C02, as it gives out. (Carbon netural)
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How is biofuel made?
Orginates from plants. Mixed with ordinary disel.
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What are biofeuls being used for?
American lorries, car users.
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Bioethanol:
From sugar canses, which contain a carbohydrate called sucrose. + Maize + Enzyme and glucose = Fermented glucose&sucrose, which is anerobically fermented to make ethanol.
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Disadvantages of bioethanol?
Expensive. Modified engines. Smells. Need space to grow crops (deforestation). Crops grow slowy. Moral reasons.
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Two ways bogas is formed?
1) Bacterial breakdown of plant material. 2) Anerobic breakdown of animal waste.
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Why are biogas generators stored underground?
Soil helps insulate walls... to keep it warm/cool.
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Describe the process that occurs in the biogas generator?
Faeces is placed into the generator. Bacteria is added to allow fermentation. The anerobic respiration produces methane.
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Quorn is high in what?
Protein&Fungus
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How is Quorn made?
Fungus grown on glucose syrup in aerobic conditions. Vitimins and minerals added to keep fungus healthy.
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Other cards in this set

Card 2

Front

Waste by humans may pollute...?

Back

Water- sewage, fertilisers, toxic chemials, Air- Smoke, gases, acid rain. Land- Pesticides/herbicides.

Card 3

Front

Give to ways gases are released into the atmosphere?

Back

Preview of the front of card 3

Card 4

Front

A rise in the Earths temperature leads to...?

Back

Preview of the front of card 4

Card 5

Front

Give examples of what land created by deforestation is used for?

Back

Preview of the front of card 5
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