(a) Bloodworms in a pond indicate that the water is polluted - Edexcel - GCSE Biology - Question 1 - 2022 - Paper 1
Question 1
(a) Bloodworms in a pond indicate that the water is polluted.
(i) Which species also indicates that the water is polluted?
A fertiliser
B lichen
C stonefly
D... show full transcript
Worked Solution & Example Answer:(a) Bloodworms in a pond indicate that the water is polluted - Edexcel - GCSE Biology - Question 1 - 2022 - Paper 1
Step 1
Which species also indicates that the water is polluted?
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Answer
The correct answer is B lichen. Lichens are sensitive to pollution, particularly to sulfur dioxide, and their presence often signifies a less polluted environment, while their absence indicates pollution.
Step 2
Give a reason why this helps them survive in polluted water.
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Answer
Bloodworms have a high level of haemoglobin in their blood, allowing them to effectively bind oxygen even in low-oxygen environments, which are often found in polluted water.
Step 3
Give two factors that affect the rate of diffusion.
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Answer
Concentration Gradient: The greater the difference in concentration of a substance across a membrane, the faster the diffusion rate.
Temperature: Higher temperatures increase the kinetic energy of molecules, leading to a faster rate of diffusion.
