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How Does Acid Rain Affect The Flora of Our Environment? (page 3)

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Author: Joseph M.

Experimental Results

The control group is the rainwater plants and the experimental group is the acid rain solution plants. The dependent variables include the amount of rainwater, the species of plant selected, the temperature, and the amount of sunlight. Independent variables include the addition of vinegar to the rainwater to form the acid rain solution. The rainwater plants maintained an overall healthy physiological appearance. The foliage remained lush and dark green in color. There was a natural withering of the flower petals in the three trials. Flower buds appeared on day six of trial three and day seven of trial one and trial two. The acid rain plants exhibited similar results within the three trials. As the week progressed, the plants showed increasing levels of distress. The pigmentation of the leaves changed progressively from dark green to light green. Then, the colors of the leaves changed from light green to yellow. Finally, the leaves showed a browning appearance. The stem changed from a vibrant dark green to yellow. As the days progressed, the flower petals wilted and fell off. The acid rain plants changed from an upright, vertical position to a sloping, downward position. These plants exhibited a dramatic physiological change because of the acidity of the water. When the pH of water decreases, the acidity increases. Pure water has a pH of 7.0 and unpolluted rainwater has a pH of 5.6. The acid rain solution that was created in this experiment has a pH of 3.0. The daily watering of the plants with this low pH resulted in the leaching of vital nutrients from the soil. This caused the acid rain plants to wither, shrivel, and nearly die.  

Conclusion

In conclusion, the experimental results show that my hypothesis is correct. The control group, which consisted of the rainwater plants, showed a normal progression of flower petal loss and maintained their healthy, lush, and dark green foliage. On the other hand, the addition of vinegar to rainwater in the experimental group caused the pigmentation of the plants foliage to change from dark green to yellow. At the end of each trial, the acid rain plants were on the brink of death. The plants exhibited extreme negative physiological changes. This included a complete loss of flower petals, and withering, drying, and shriveling of the plants foliage. Due to the similarities in the outcomes of the experimental trials, my hypothesis was supported by the data. Therefore, no calculated experimental error was observed.  

Questions for Further Research

If I were to perform my project again, I would measure the pH of the soil with a pH indicator. I could expand upon my research by explaining in greater detail what is acid rain and how is acid rain formed. I could include the chemical formulas of the formation of acid rain.

Bibliography

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Tennesen, M (2010). Sour showers: acid rain returns—this time it is caused by nitrogen emissions. Scientific American, Retrieved September 18, 2010, from http://www.scientificamerican.com/article.cfm?id=acid-rain-caused-by-nitrogen-emissions                      

What is acid rain and what causes it. (2002, August 6). Almanac of Policy Issues, Retrieved October 16, 2010, from http://www.policyalmanac.org/environment/archive/acid_rain

 

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