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llanderman
llanderman

This experiment tested the effects of a gibberellic acid solution on the closing speed of Venus flytrap leaves' two closing phases. It was hypothesized that the acid would increase the speed of the growth-related second phase but not the first, turgor pressure-driven phase. The results found that both phases closed faster with the acid, but statistical tests found a significant difference only for the second phase, supporting the original hypothesis. The experiment could be improved by controlling environmental variables better and using more plants.

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Conclusion This experiment was designed to test the effects of a 1 ppm solution of bibberellic acid on the speed of both closing phases of the Venus flytrap’s leaves. It was hypothesized that because of the second closing phase is thought to be a growth response, the application of gibberellic acid would increase the speed of the reaction; however, the first phase of closing, which is basically a change in turgor pressure, would not be affected. It was found that the mean time for each phase was less in the group of plants treated with gibberellic acid. These data appeared not to support the hypothesis concerning Phase 1 but to support the hypothesis concerning Phase 11; that is, the data suggested that the speed of both reactions was increased by the application of gibberellic acid. However, results of t tests completed on the data showed that there was significant difference between the control and experimental groups only with the second phase of closure: the reach hypothesis was supported by the data. The first phase of closure was unaffected by gibberellic acid, whereas the speed phase of closure was increased. The data may have been affected somewhat by uncontrolled environmental variables such as temperature and humidity: this experiment could have been improved by keeping the Venus flytraps in a climatorium, where more outside variables could be controlled. Using more plants would also increase the accuracy of the data. For variations in closing speed could be correlated and accounted for: the effect of gibberellic acid on the Venus flytrap could be established more firmly.

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Sample conclusion

  • 1. Conclusion This experiment was designed to test the effects of a 1 ppm solution of bibberellic acid on the speed of both closing phases of the Venus flytrap’s leaves. It was hypothesized that because of the second closing phase is thought to be a growth response, the application of gibberellic acid would increase the speed of the reaction; however, the first phase of closing, which is basically a change in turgor pressure, would not be affected. It was found that the mean time for each phase was less in the group of plants treated with gibberellic acid. These data appeared not to support the hypothesis concerning Phase 1 but to support the hypothesis concerning Phase 11; that is, the data suggested that the speed of both reactions was increased by the application of gibberellic acid. However, results of t tests completed on the data showed that there was significant difference between the control and experimental groups only with the second phase of closure: the reach hypothesis was supported by the data. The first phase of closure was unaffected by gibberellic acid, whereas the speed phase of closure was increased. The data may have been affected somewhat by uncontrolled environmental variables such as temperature and humidity: this experiment could have been improved by keeping the Venus flytraps in a climatorium, where more outside variables could be controlled. Using more plants would also increase the accuracy of the data. For variations in closing speed could be correlated and accounted for: the effect of gibberellic acid on the Venus flytrap could be established more firmly.