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What are the biological consequences of pollution of air by sulphur dioxide and by carbon monoxide?
Acid raid forms in sky and damages environment by:
Acidification of lakes - kills bacteria, algae and fish
Disrupts food webs in ecosystems
Kills conifer trees
Acidifies the soil - leaches out important minerals and damages root hairs of plants, stunting their growth
What is a greenhouse gas?
A green house gas is a gas that traps the sun’s infrared radiation in the earth’s atmosphere
Name 5 green house gases
CO2, Methane, CFC’s, Water vapour, nitrous oxide
How do humans contribute to greenhouse gases?
Humans burn fossil fuels which release CO2 into the atmosphere and sulphur and nitrous oxides
How does an increase of greenhouse gases lead to global warming?
If there are more green house gases in the atmosphere, more of the Sun’s infrared radiation will be trapped inside the Earth’s atmosphere and in consequence heats up the Earth’s temperature
Global warming consequences
Melts the ice caps, rises sea levels
more frequent natural disasters
disrupt ecosystems
alter weather patterns
impact biodiversity
What are the biological consequences of pollution of water by sewage?
provides a good source of food for bacteria
as they respire aerobically, the oxygen depletes
leads to death of many aquatic life as there is an insufficient supply of oxygen
What are the biological consequences of eutrophication?
caused by leached minerals from fertiliser
excessive nutrients from fertilser cause the aquatic plants to grow rapidly
Algae however also grows rapidly on the surface of the water, and blocks the sunlight and oxygen from entering the water
Death of organisms that require oxygen dissolved in water
What are the biological effects of deforestation?
soil erosion occurs as no roots to anchor the soil
disturbance of evapotranspiration - too much water in soil
More CO2 in atmosphere, less O2
Contributes to global warming
