Biology - Human Influences

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How do farmers attempt to maximise crop yield? Explain how each of these methods works.
By use of green-houses, polytunnels, fertilisers, pesticides and/or biological pest control.
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How are fish farms engineered to maximise yield? Explain.
Selective breeding, controlled numbers, species separated, food quality & frequency.
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What are the problems of breeding using fish farms?
Disease spreads quickly, wild stocks are depleted to feed farms, excess food & waste can cause eutrophication/pollution.
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What is the greenhouse effect?
the trapping of the sun's heat due to UV short-wave radiation being more easily transmitted by the gases than infra-red long-wave radiation.
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What effects do increased levels of greenhouse gases have?
Global warming which leads to sea levels rising and weather and rainfall patterns changing.
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Explain the causes and effects of sulfur dioxide air pollution.
Released in burning of fossil fuels. Combines with rain and causes plant damage, building damage and can kill stream and lake life.
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Explain the causes and effects of air pollution by carbon monoxide.
Released in driving and other fuels, carbon monoxide is a toxic poison which can be fatal to humans. Bonus: how?
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Which are the greenhouse gases? (Hint: there are 5)
Carbon dioxide, Methane, Water vapour, Nitrous Oxide and ChloroFlouroCarbons
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What are the main three substances that cause water pollution?
detergents, sewage and nitrates. Explain subsequent process ending in eutrophication.
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What are the causes of deforestation in the modern world?
Demand for: beef, soya crops, minerals, palm oil, wood, oil and HEP.
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What are the four main effects of deforestation?
Mineral leaching, soil erosion, less transpiration and affects balance of oxygen:carbon dioxide (greenhouse gas)
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Other cards in this set

Card 2

Front

Selective breeding, controlled numbers, species separated, food quality & frequency.

Back

How are fish farms engineered to maximise yield? Explain.

Card 3

Front

Disease spreads quickly, wild stocks are depleted to feed farms, excess food & waste can cause eutrophication/pollution.

Back

Preview of the back of card 3

Card 4

Front

the trapping of the sun's heat due to UV short-wave radiation being more easily transmitted by the gases than infra-red long-wave radiation.

Back

Preview of the back of card 4

Card 5

Front

Global warming which leads to sea levels rising and weather and rainfall patterns changing.

Back

Preview of the back of card 5
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