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Effects of different concentrations of a heavy metal chloride on the growth of cress seedlings Introduction Heavy metals are everywhere, be it lead in car exhausts and industrial emissions, cadmium in paints, mercury in amalgams or zinc in batteries. These compounds invariably dissolve in rain, enter soil and are taken up by plant roots. If the metal is not present in sufficient quantities to kill the plant outright, it accumulates and is passed on to anything that eats it. Thus heavy metal accumulates down a food chain, causing the food we eat to be very contaminated. However I am more interested in those times when the metal is present in sufficient quantities to either kill the plant or inhibit growth. Contamination can affect plants in many ways: It can disrupt the normal plant/water relationship. It can indirectly affect plant metabolism, for example by disrupting nutrient availability. It may be directly toxic to plant cells. Heavy metals are systemic killers not contact killers....

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