Cholera is a disease caused by a pathogen - Edexcel - GCSE Biology - Question 4 - 2013 - Paper 1
Question 4
Cholera is a disease caused by a pathogen.
(a) (i) State the type of pathogen that causes cholera.
(ii) Complete the sentence by putting a cross (X) in the box nex... show full transcript
Worked Solution & Example Answer:Cholera is a disease caused by a pathogen - Edexcel - GCSE Biology - Question 4 - 2013 - Paper 1
Step 1
State the type of pathogen that causes cholera.
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Answer
The type of pathogen that causes cholera is bacteria.
Step 2
Complete the sentence by putting a cross (X) in the box next to your answer.
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Answer
The cholera pathogen is spread in:
D in water.
Step 3
Describe the trend in the recorded cases of cholera shown in the maps.
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Answer
The trend shows a decrease in the number of cholera cases recorded from 1950 to 2004.
Step 4
Suggest two reasons for this trend.
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Answer
Improved sanitation and access to clean drinking water.
Effective public health interventions and vaccination efforts.
Step 5
Explain how the physical barriers of the body can help to prevent infection by pathogens.
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Answer
The physical barriers of the body, such as skin, provide a protective layer that prevents the entry of pathogens. Scab formation acts as a barrier over wounds, preventing pathogens from entering. Additionally, cilia in the respiratory tract trap pathogens and waft them upwards to be expelled. Mucus also traps pathogens, facilitating their removal.
Step 6
State the names of two chemicals that can be used to control infection.
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