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Investigating the Breathing Rates of Locusts.

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Introduction

Investigating the Breathing Rates of Locusts. Results Breathing Rate 30s-1 Percentage CO2 Locust 1 Locust 2 Average of Both 5 22 16 19 10 29 20 24.5 15 54 48 51 20 72 64 68 Conclusion As you can see from the graphs above, there is a general trend, between the two locusts. The graph shows that the higher the CO2 concentration in the atmosphere that the locust breathes in, the more breaths in 30 seconds that it takes. So when we increased the concentration of carbon dioxide, in the atmosphere of the locust, it will breathe more. The reason that the locust's breathing rate increases, when there is an increase in the percent of Carbon dioxide in the locusts' environment, is that carbon dioxide directly affects the breathing rate. In locusts, the ventilation centre, in the metathracic ganglion, makes the control of the breathing rate. This is stimulated by nerve signals, which are emitted from carbon dioxide stimuli, which are called chemoreceptors, which are situated in the nerve ganglion. ...read more.

Middle

Evaluation Although, I think that the experiment well, there were a few problems with the experiment, which meant that there might have been anomalous results, or which could have effected our results. The first problem that I found with the expriment, was that the bung at the end of the test tube was made of cotton wool, this meant, that due to ficks law, some of the carbon dioxide, or oxygen could have diffused out of the test tube, through the cotton wool bung, thereby effecting our results. Instead I would use a rubber bung, which would have a tube attached to the end, so we would be able to prevent any of the oxygen, carbon dioxide mixture leaking out, or any other gases leaking in, which could effect the results we get. We also used a different size syringe; to the one we kept the locust in, to fill the syringe with gas. ...read more.

Conclusion

We also only used one type of locust from the same area. This only shows us the effect of carbon dioxide, on the locusts that are living in Clifton College. We should try to experiment with other types of locust, and locusts from different parts of the UK and the world. One factor that could have affected the results is that there is going to be an increase in the amount carbon dioxide, in the locust's atmosphere, as the experiment progresses, as the locust will use up the oxygen in the atmosphere, and replace it with carbon dioxide. So each subsequent breath that it takes, will contain more carbon dioxide that the previous breath. We should have also given the locust a set time, between each atmosphere concentration, to recover, and get back to a normal breathing rate. Another thing that could have effected the results, is that the ventilation centre can also be controlled by external stimuli, acting through the cephalic ganglion; for example the rate of respiration, thus the breathing rate might be affected if the insect was handled. ...read more.

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