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An investigation into the effects of different concentrations of lead chloride on the growth of plants, (cress).
Member rating: No Rating | Words: 5681 | Submitted: Mon Oct 15 2007
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A2 Biology coursework Skill P: Planning Title: An investigation into the effects of different concentrations of lead chloride on the growth of plants, (cress). Aim: To find out how changing different concentrations of a heavy metal chloride, namely lead chloride, affects the growth of cress seeds. Background information: Lead is a grey metal, derived from ore-bearing minerals. Heavy metals compounds, such as lead chloride are able to dissolve in rain and enter the soil surrounding the plants. Lead is largely emitted into the atmosphere in a gaseous state through emissions of vehicles using fuel that contains lead. Other sources include additives in gasoline and paints, fertilisers and mining. For plants, lead is a toxin and when present in large amounts it can cause severe decreases in their growth. Symptoms include stunted growth and the yellowing of plants (called chlorosis). Heavy metals collect in different organs of a plant and produce variable effects. Lead disrupts the plant's...
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