Human Influences on the environment

How do polytunnels help increase crop yield?
Increase the rate of photosynthesis (controlling the temperature, light and carbon dioxide)
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How do fertilisers increase crop yield?
Return nitrates and minerals to the soil
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How do pesticides increase crop yield?
Chemicals that kill the pests
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What are the disadvantages to pesticides?
Expensive, pests can become resistant and they can cause environmental damage
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What is biological pest control?
Uses another organism to control a pest.
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What is the disadvantage to biological pest control?
It only reduces the number of pests so they don't cause crop damage.
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What environmental features are controlled within fish farming?
Water quality, numbers of fish, interspecific competition, food quality and selective breeding.
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What are the main disadvantages to fish farming?
Disease spreads quickly, waste from the fish can cause water pollution and wild fish stocks are depleting.
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What three main substances contribute to air pollution?
Sulphur dioxide, carbon monoxide and CFC's
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How does sulphur dioxide pollute the air?
Its produced when fossil fuels burn, it mixes with water vapour in the air and it makes acid rain
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What damage does sulphur dioxide do to the environment?
Damages plants and life in streams and lakes, pollutes the water and causes damage to buildings.
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How does carbon monoxide pollute the air?
Formed when fuels are burned with little oxygen. It replaces oxygen in the haemoglobin in the blood. Can lead to suffocation.
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How do greenhouse gases increase global warming?
They trap heat around the earth and with an increase in production of these gases the planet gets too warm.
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What environmental changes happen as a result of global warming?
Sea levels rise and changes in weather patterns.
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What causes eutrophication?
Fertiliser nitrates, sewage and detergents.
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How does eutrophication happen?
Nitrates are leached from the soil into lakes and rivers and algae growth increases and uses up all the oxygen so other animals cannot survive.
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How does deforestation affect the environment?
Minerals are leached out of the soil, soil is eroded, water cycle is disturbed without transpiration, and the balance of O2 and CO2 is affected.
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How does deforestation increase the amount of CO2 in the air?
With less trees less CO2 is being used up and with the slash and burn method even more CO2 is being added.
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Other cards in this set

Card 2

Front

How do fertilisers increase crop yield?

Back

Return nitrates and minerals to the soil

Card 3

Front

How do pesticides increase crop yield?

Back

Preview of the front of card 3

Card 4

Front

What are the disadvantages to pesticides?

Back

Preview of the front of card 4

Card 5

Front

What is biological pest control?

Back

Preview of the front of card 5
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Comments

Alishxn

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Good but can be made a bit harder as the questions were really easy but good for revision 

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