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 sludgeworm
(ii) Bloodworms have a high level of haemoglobin in their blood - 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 sl... show full transcript
Worked Solution & Example Answer: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 sludgeworm
(ii) Bloodworms have a high level of haemoglobin in their blood - 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 option is D: sludgeworm. Sludgeworms are known to thrive in polluted waters due to their ability to tolerate low oxygen levels and high levels of organic pollutants.
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, which enables them to efficiently transport oxygen. This adaptation allows them to survive in environments where oxygen levels are low due to pollution.
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 between two regions, the faster the rate of diffusion.
Temperature: Higher temperatures increase the kinetic energy of molecules, which enhances the rate of diffusion.
