Environmental Lab Essay

341 Words2 Pages
Hypothesis: We believe that those seeds placed in the petri dishes with a lower percentage of salinity will have a higher rate of germination then those placed in petri dishes with a higher percentage of salinity, this is due to the heightened ability to dehydrate the plants in an environment with a high salinity. Procedure: 1. Cut filter papers to size and place one in each petri dish. 2. Place 10 seeds in each petri dish. 3. Spray a different concentration of salt water in each petri dish. Be sure to use at least enough water to saturate the filter paper, however do not use too much water. These are the different concentrations: 0% (distilled water), 0.01%, 0.1%, 0.5%, 1%, 2%, 3%, 4%. 4. Space the seeds out so that they are not too close to each other. 5. Place the petri dishes in a sealed plastic bag, taking care to not shift the seeds too much. 6. Check on the seeds daily to see if the seeds need more water. If so, spray each dish with its appropriate salt water concentration. 7. Record how many seeds germinate in each dish each day. Materials: 8 petri dishes, 8 pieces of filter paper, 80 little marvel pea seeds, 50 mL of distilled water, and 50 mL of each of the following NaCl solutions: 0.01%, 0.1%, 0.5%, 1%, 2%, 3%, 4% Analysis: The first day after watering our seeds none of them had germinated, but after the weekend passed seven seeds had germinated in the distilled solution. Three seeds germinated in the .1% solution and one germinated in the .01% solution. In the rest of the solutions none of the seeds had germinated. This pattern continued throughout our experiment. We saw that the lower the present of solution the more seeds germinated. This can be shown in our graph below. Graph: % Solution # of seeds germinated |0% |9 | |0.01% |6

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