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3.1 Communicable diseases

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Question 91
F

A company has developed a new insecticide, insecticide X, for use on mosquito nets. Scientists sprayed 20 nets with insecticide X and 20 nets with the insecticide that is already

used. They released 50 mosquitoes into a sealed cage containing each net and counted the number of dead mosquitoes after 30 minutes.

a.

Give the independent variable in this investigation.

[1]
b.

Give two variables that the scientists must control.

[2]
c.

The scientists used 20 nets for each insecticide instead of one net. Explain why.

[2]
d.

Suggest one further investigation the scientists should carry out before nets treated with insecticide X are sold.

[1]
Markscheme

3.1 Communicable diseases Questions

  1. GCSE
  2. /Biology
  3. /3.1 Communicable diseases

176 exam-style questions on AQA GCSE Biology 3.1 Communicable diseases, covering 3.1.1 Communicable (infectious) diseases, 3.1.2 Viral diseases, 3.1.3 Bacterial diseases, 3.1.4 Fungal diseases, 3.1.5 Protist diseases, 3.1.6 Human defence systems, 3.1.7 Vaccination, 3.1.8 Antibiotics and painkillers, and 3.1.9 Discovery and development of drugs. Each one has a worked solution and a mark scheme showing where the marks go.

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