GCSE AQA Biology Health & Disease: Eating food containing Salmonell

Question

Eating food containing Salmonella bacteria can cause illness.

Two symptoms of infection by Salmonella are vomiting and diarrhoea.

What causes these symptoms?

Give two ways a person with a mild infection of Salmonella can help prevent the spread of the bacteria.

A restaurant owner employed a scientist to test the effectiveness of two kitchen cleaning liquids:
- before the surfaces had been cleaned with the cleaning liquids;
- after the surfaces had been cleaned with the cleaning liquids.

The samples were then analysed for the number of bacteria they contained.

The results are shown in Figure 1.

Which cleaning liquid is the more effective? Give a reason for your answer.

The scientist investigated the effect of cleaning liquid A and cleaning liquid B on Salmonella bacteria grown in a laboratory.

Figure 2 shows how the investigation was set up.

The Petri dish was placed in an incubator at 25 °C for 48 hours.

After 48 hours, the scientist calculated the area around each paper disc where no bacteria were growing.

The results are shown in Table 1.

Eating food containing Salmonella bacteria can cause illness - AQA - GCSE Biology - Question 1 - 2018 - Paper 1

Worked Solution & Example Answer:Eating food containing Salmonella bacteria can cause illness - AQA - GCSE Biology - Question 1 - 2018 - Paper 1

What causes these symptoms?

Give two ways a person with a mild infection of Salmonella can help prevent the spread of the bacteria.

Which cleaning liquid is the more effective? Give a reason for your answer.

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