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Verónica Rosinha 5IB Effects of acid rain in germination and growth of mustard seeds Research question How is the germination and growth of mustard seeds affected by exposure to acid rain? Hypothesis: By carrying this investigation I expect that acid rain will decrease the germination and growth rate of mustard seeds. The lower the pH, the more the germination and growth will be decreased. General background Acid rain is caused by the presence of SO2 and NO2 in the air, which dissolve in the water forming sulphuric acid and nitric acid. It usually has a pH value of about 5; however this value can be lower. Due to the presence of acids, the acid rain causes decreased growth in plants, whose usual effects are usually poor root growth and poor leaf development. Poor root growth can result from exposure to soil of low pH, as the shape of proteins - including enzymes - are changed. Poor leaf...

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