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# An investigation into the effects of different concentrations of lead chloride on the growth of plants, (cress).

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Volume of 0.02moldm-3 lead chloride solution required (ml) Volume of distilled water required (ml) 0.000 0.00 15.00 0.005 3.75 11.25 0.010 7.50 7.50 0.015 11.25 3.75 0.020 15.00 0.00 * Once all the 5 concentrations are made up, place them over each cotton face pad in each petri dish, and label the dish with its corresponding label * Using tweezers, arrange 25 seeds in each petri dish using the method of distribution shown by the grid in the second test above. * Place each petri dish into a separate polythene bag and fill with some air. Tie the bag and allow the cress seeds to grow for 5 days in an area with lots of sunlight. * After 5 days, measure the length of the shoot (starting from the seed and not including the root) of each cress seed in all five petri dishes. This is done using a ruler. N:B whilst carrying out this experiment, make sure eye protection is worn at all times, with plastic gloves carrying the hands. Protective clothing should also be worn as well The table below shows the results of this experiment. The average length of shoot of cress seeds was calculated once more, using the previous method - (see appendix for calculations). A table to show the average length of shoot of cress seeds grown in different concentrations of lead chloride. Concentration of lead chloride (moldm-3) Average length of shoot of cress seeds (mm) 0.000 47.8 0.005 23.3 0.010 12.6 0.015 5.68 0.020 4.28 Note: All figures in the table are correct to 3 significant figures. The results show that as the concentration of the lead chloride increases, the growth of the cress seeds decreases. This means that lead chloride, does have a negative effect on the growth of cress seeds. The results also show that the growth of the cress seeds is measurable, with the lowest average length of shoot being no less than 4.28mm for 0.02moldm-3 lead chloride. ...read more.

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