CAIE IGCSE Biology 10.1.17 Cholera Bacterium Produces a Toxin Questions
Practise tracing cholera toxin effects from chloride secretion to osmosis, diarrhoea, dehydration and ion loss.
- Syllabus
- 2026–2028
- Course
- Biology 0610
Exam points
- state that cholera toxin causes chloride ions to be secreted into the small-intestine lumen
- explain that secreted chloride ions lower lumen water potential and draw water into the gut by osmosis
- link osmotic water movement to watery diarrhoea, dehydration and loss of water/ions
CAIE IGCSE Biology 10.1.17 Cholera Bacterium Produces a Toxin Questions question 1
[Maximum number: 6]
Cholera is a transmissible disease.
Question (a)
(a)
Explain how cholera causes diarrhoea.
any four from:
cholera / pathogen, releases toxin ;
(toxin) causes (more) chloride released (into small intestine) ;
lowering water potential (in lumen) ;
ref. to, osmosis / movement of water (into the lumen) ;
(diarrhoea is) loss of watery faeces ;
loss of salts / loss of minerals / dehydration ;
Question (b)
(b)
Describe how diarrhoea is treated.
any two from:
oral rehydration therapy ;
drink mixture of, sugar / nutrients and, salt/ions ;
replace lost, water / fluids ;
AVP ;
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