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Investigation To determine The Effect Of Carbon Dioxide On The Ventilation Rate Of Locusts. Introduction To determine what effect carbon dioxide would have on the ventilation rate of locusts the following method was used. A Locust was placed head first into a boiling tube and held in by a piece of cotton wool. The boiling tube was laid flat onto the desk, the ventilation rate of the locust measured by counting the swellings of the abdomen which occurred with each inspiration. The level of carbon dioxide was then increased by breathing into the test tube for 1 second. The locust was allowed 20 seconds to adjust to the new concentration and then a reading was taken at this concentration. This was repeated using breaths of lengths, 2,3,4,5 seconds and also repeated in triplicate. Results The below table shows the number of abdominal swellings observed from the locust in a 30 second period under different...

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