Bloodworms in a pond indicate that the water is polluted - Edexcel - GCSE Biology - Question 1 - 2022 - Paper 1
Question 1
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 sludg... show full transcript
Worked Solution & Example Answer: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 species that also indicates that the water is polluted is D sludgeworm. Sludgeworms are typically found in polluted environments, making them bioindicators of water quality.
Step 2
Give a reason why this helps them survive in polluted water.
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Answer
The high level of haemoglobin in bloodworms allows them to effectively transport oxygen even in low-oxygen conditions, which is common in polluted waters. This adaptability is crucial for their survival.
Step 3
Give two factors that affect the rate of diffusion.
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Answer
Two factors that affect the rate of diffusion are:
Temperature: Higher temperatures increase the kinetic energy of molecules, which enhances the rate of diffusion.
Concentration gradient: A greater difference in concentration between two areas leads to a faster rate of diffusion as molecules move from areas of high concentration to areas of low concentration.
