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Presentation Unit 3- Biology and our universe
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Investigate How To Measure Human Activities Which Can Impact The Environment.
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Investigate How To Measure HumanActivities Which Can Impact The
Environment.
, Lichens
Presence of living organisms such as lichens can indicate the level of air pollution within a certain area.
* A lichen, is two organisms functioning as a single, stable unit.
* There are about 17,000 species of lichen worldwide (Vidyasagar, 2016).
•The various types of lichens have varied tolerance levels to pollution, they absorb water and minerals through the
from rainwater, which makes them very sensitive to atmospheric pollution. They are especially sensitive to sulphu
pollution in the air (Air Pollution, 2016).
• Lichens can be prevented from growing as air pollutants are dissolved in the rainwater
* The more lichens the less the pollution. * The less lichens the more the pollution.
Some Examples of lichens are:
• If air is severely polluted with sulphur dioxide there may be no lichens present. If the air is clean, crusty, bushy a
become abundant.
• A few lichen species can tolerate quite high levels of pollution and are commonly found on pavements, walls and
most sensitive lichens are shrubby and leafy while the most tolerant lichens are all crusty in appearance (Woods &
2012).
•Lichen diversity decreases as you move closer into a city. Town areas are less likely to have lichen growth as there
pollution from vehicles, factories, businesses which released into the atmosphere, the further you move away from
more likely you will see lichen growth on trees, rocks etc (ANBG, 2012).
This Photo by Unknown Author is licensed under CC BY-SA This Photo by Unknown Author is licensed under CC BY-SA This Photo by Unknown
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