The photographs show three species of lichen. Each species can tolerate different concentrations of pollutants present in the air. (i) Complete the sentence by putting a cross (X) in the box next to your answer. Lichens are examples of A living indicators B pathogens C pollutants D vectors (ii) Explain which one of these species is most likely to be found near a coal-burning power station.

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The photographs show three species of lichen - Edexcel - GCSE Biology - Question 6 - 2013 - Paper 1

Question 6

The photographs show three species of lichen. Each species can tolerate different concentrations of pollutants present in the air. (i) Complete the sentence by put... show full transcript

Worked Solution & Example Answer:The photographs show three species of lichen - Edexcel - GCSE Biology - Question 6 - 2013 - Paper 1

Step 1

Complete the sentence by putting a cross (X) in the box next to your answer.

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Answer

Lichens are examples of A living indicators. This is because lichens are sensitive to air quality and can indicate levels of pollutants in the environment.

Step 2

Explain which one of these species is most likely to be found near a coal-burning power station.

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Answer

Species 1, which is tolerant to oxides of nitrogen, is most likely to be found near a coal-burning power station. This is due to the fact that coal combustion typically releases nitrogen oxides as pollutants. Species 1’s tolerance to these compounds suggests it has adapted to thrive in this environment, whereas species 3, which is not tolerant to nitrogen or sulfur oxides, would likely be less prevalent in such polluted areas.

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