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To investigate the affects of heavy metals such as Lead Chloride, on the length of both the stem and roots of cress seeds.
Member rating: No Rating | Words: | Submitted: Fri Aug 29 2003
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Affects of Heavy Metal on Stem & Root Length Aim: To investigate the affects of heavy metals such as Lead Chloride, on the length of both the stem and roots of cress seeds. Background Investigation: Lead is a soft metal having little tensile strength, and it is the densest of the common metals excepting gold and mercury. It has a metallic luster when freshly cut but quickly acquires a dull colour when exposed to moist air. Heavy metals such as lead are harmful to both humans and plants. Lead is used in the manufacture of batteries, metal products, paints, and ceramic glazes. In humans; exposure to lead can occur from breathing contaminated workplace air or house dust or eating lead-based paint chips or contaminated dirt. Lead is a very toxic element, causing a variety of effects even at low dose levels. Brain damage, kidney damage, and gastrointestinal distress are seen from...
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