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: 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 shown in the maps indicates a decline in the recorded cases of cholera over the years from 1950 to 2004. There are significantly fewer areas shaded in black in the latter maps.
Step 4
Suggest two reasons for this trend.
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Answer
Improved sanitation and drinking water quality in many regions have reduced the spread of cholera.
Increased public health awareness and vaccination programs may have contributed to controlling the outbreak.
Step 5
Explain how the physical barriers of the body can help to prevent infection by pathogens.
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The physical barriers of the body include:
Skin: acts as a primary barrier preventing the entry of pathogens.
Scab formation: prevents pathogens from entering wounds.
Cilia: traps pathogens and wafts them upwards, preventing entry into the respiratory system.
Mucus: traps pathogens, aiding their removal from the body.
Step 6
State the names of two chemicals that can be used to control infection.
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