Biology 9700 · AS & A Level · The gas exchange system

The gas exchange system — practice question

Some research indicates that smoking raises the chance of developing lung cancer. The graphs illustrate the percentage of smokers and the number of deaths from lung cancer in men in two age groups between 1950 and 1998. Which statement is not supported by the data in the graphs?

  • ADeaths from lung cancer in men aged 35-59 years decreased by 50% over the period of the study.
  • BDeaths from lung cancer in men aged 60-74 years increased up to 1970.
  • CThe data for men aged 60-74 years between 1950 to 1970 suggests that lung cancer takes up to 20 years to develop.
  • DThe number of men aged 35-59 years who were smokers decreased by approximately 60% over the period of the study.

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