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The Effect of gas exchange on a locusts' breathing Aim- To see the effect of Carbon dioxide on a locusts' ventilation rate. Method- Since the locust was already in the 20cm³ plastic syringe held in a clamp, our first step was to monitor its ventilation movements. By looking at the abdomen, we could clearly see the ventilation movements of the locust, which we counted for thirty seconds. We repeated this three times under normal atmospheric conditions. Our next task was to count the breathing rate again, yet this time under a Carbon dioxide enhanced environment. We took a three way tap and attached this to the end of the plastic syringe, also we removed the piston and fitted loosely a small amount of cotton wool. In order for the atmosphere surrounding the locust to have a higher Carbon dioxide level, we attached a straw to the end of the tap, turning...

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