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B1.4 pollution detectors

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Steve BishopLecturer at Further education

B1.4 pollution detectors

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Pollution detectors
B1.4 pollution detectors
Lichen
Usefulness of lichens as
bio-indicators
• They are found almost everywhere
and at all seasons
• They absorb nutrients and pollutants
from the air, often to high
concentrations
• Different species show different
sensitivities and accumulation abilities
• They are symbiotic organisms. The
fungus cannot survive if the algae is
killed by pollution
B1.4 pollution detectors
B1.4 pollution detectors
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B1.4 pollution detectors

  • 4. Usefulness of lichens as bio-indicators • They are found almost everywhere and at all seasons • They absorb nutrients and pollutants from the air, often to high concentrations • Different species show different sensitivities and accumulation abilities • They are symbiotic organisms. The fungus cannot survive if the algae is killed by pollution
  • 10. Indicator species Pollution Level Mayfly nymph Clean Caddis fly larva Low Water louse High Sludgeworm Very high
  • 11. (a) What can you conclude from the results about the level of pollution in the stream? Give your reasons. [3 marks] The level of pollution is decreasing / the stream has become cleaner. [1] The species that live in cleaner water have increased or specific examples. [1] The species that live in polluted water have decreased or specific examples.[1]
  • 12. (b) Nona said that these samples should be taken at the same time each year but Rhys said it doesn’t matter. State who you think is right, giving a reason. [1 mark] (c) State one other non-biological factor that could be measured and used as an indicator of the level of pollution in the stream. [1 mark] (b) (Nona because) water conditions such as temperature must be the same to be a valid comparison. [1] (c) Oxygen/pH/heavy metals/nitrate/phosphate/pesticide (Any 1) [1]