3.3 Bacterial, fungal and protist diseases
6 exam questions worth 13 marks. Write your answer, open the mark scheme, then give yourself the marks you earned. Your answers are saved on this device.
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Explain why a person with Salmonella food poisoning has diarrhoea and vomiting.
Mark scheme
- the bacteria produce / secrete toxins (1)
- (toxins) damage the gut / cause the symptoms (1)
Model answer
The Salmonella bacteria release toxins, which damage the lining of the gut and cause the symptoms.
Gonorrhoea used to be treated with penicillin. Explain why this is no longer effective, and give one way to prevent its spread.
Mark scheme
- many strains (of the bacteria) are resistant to penicillin (1)
- use condoms / trace and treat partners / fewer sexual partners (1)
Model answer
Many strains of the bacteria are now resistant to penicillin. Using a condom during sex prevents the spread.
Explain how rose black spot reduces the growth of a rose plant, and describe two ways gardeners can control it.
Mark scheme
- spots / leaves drop off so less (leaf area for) photosynthesis (1)
- so less glucose for growth (1)
- spray with fungicide (1)
- remove and destroy affected leaves (1)
Model answer
Rose black spot causes black spots and makes the leaves fall early, so the plant carries out less photosynthesis and makes less glucose for growth. Gardeners can spray the plant with fungicide, and remove and burn the infected leaves.
What type of pathogen causes malaria?
Choose one answer.
Correct Not quite: the answer is Protist
Mark scheme
D: protist
Model answer
D: a protist, carried by mosquitoes.
Mosquitoes are the vectors of malaria.
Explain what this means.
Mark scheme
- mosquitoes carry the protist / pathogen (1)
- from one person to another (when they bite) (1)
Model answer
Mosquitoes carry the malaria protist from an infected person to another person when they bite.
Give two ways to reduce the spread of malaria.
Mark scheme
Any two from:
- mosquito nets (1)
- insecticides (1)
- drain standing water / stop mosquitoes breeding (1)
- antimalarial drugs (1)
Model answer
Sleep under mosquito nets and drain any standing water where mosquitoes breed.
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