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6. 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 less CO2 is being added.
  • With less trees less CO2 is being used up and with the slash and burn method even more CO2 is being added.
  • With less trees more CO2 is being used up and with the slash and burn method even more CO2 is being added.

7. What causes eutrophication?

  • Fertiliser hydroxides, sewage and detergents.
  • Fertiliser nitrates, sewage and detergents.
  • Fertiliser phosphates, sewage and detergents.

8. How does deforestation affect the environment?

  • Minerals are leached out of the soil, soil is eroded, air cycle is disturbed without transpiration, and the balance of O2 and CO2 is affected.
  • 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.
  • Minerals are leached out of the soil, soil is eroded, water cycle is disturbed without transpiration, and the balance of NO2 and CO2 is affected.

9. What environmental changes happen as a result of global warming?

  • Sea levels rise and changes in weather patterns.
  • Sea levels lower and changes in weather patterns.
  • Sea levels rise and weather patterns don't change.

10. How do greenhouse gases increase global warming?

  • hey trap heat around the earth and with a decrease in production of these gases the planet gets too warm.
  • They trap heat around the earth and with an increase in production of these gases the planet gets too warm.
  • hey trap heat around the earth and with an increase in production of these gases the planet gets too cold.

11. What is biological pest control?

  • Uses technology to control a pest.
  • Uses another organism to control a pest.
  • Uses chemicals to control a pest.

12. What environmental features are controlled within fish farming?

  • Plant quality, numbers of fish, intraspecific competition, food quality and unselective breeding.
  • Water quality, numbers of fish, interspecific competition, food quality and selective breeding.
  • Net quality, numbers of fish, interspecific competition, fish quality and selective breeding.

13. What damage does sulphur dioxide do to the environment?

  • Increases number of plants and life in streams and lakes, pollutes the water and causes damage to buildings.
  • Damages plants and life in streams and lakes, pollutes the water and causes damage to buildings.
  • Damages plants and life in streams and lakes, pollutes the water and causes damage to clothing.

14. How do pesticides increase crop yield?

  • Chemicals that kill the pests
  • Chemicals that produce pests
  • Chemicals that kill female pests

15. What are the disadvantages to pesticides?

  • Expensive, pests can be become resistant and they can cause high humidity
  • Expensive, pests can become resistant and they can cause environmental damage
  • Expensive, pests can eat the chemicals and they can cause environmental damage

16. What three main substances contribute to air pollution?

  • Sulphur dioxide, carbon monoxide and chlorine gas
  • Sulphur dioxide, carbon monoxide and CFC's
  • Sulphur dioxide, carbon monoxide and oxygen

17. How do polytunnels help increase crop yield?

  • Increase the rate of photosynthesis (controlling the temperature, light and carbon dioxide)
  • decrease the rate of photosynthesis (controlling the temperature, light and carbon dioxide)
  • increase the rate of photosynthesis (controlling the temperature, light and oxygen)

18. 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
  • Its produced when fossil fuels burn, it mixes with nitrous oxide in the air and it makes acid rain.
  • Its produced when fossil fuels burn, it mixes with ethanol in the air and it makes acid rain