AP Environmental Science- Period 6
Soil Salinization Lab By: Sierra, Jacob, Jasmine and Willie Hypothesis: We hypothesize that with a lower solution of salt concentration added when placed in the petri dish and given substantial amount of light and darkness, there will be germination given the proper care. While, with a higher concentration, there would be an excessive amount of solution that salt will denature the enzymes necessary for metabolization where germination would not occur. Purpose: The purpose of this lab was to determine the amount of salt concentration solution necessary to have different plant species show any effects of salinization and if there will be germinating seeds. We used different kinds of seeds and added them to distinct salt concentrations to also determine the capacity the plant species has to germinate. Materials: The materials we used to perform the lab were beakers, graduated cylinders, petri dishes, 5% (NACI) sodium chloride solution digressing to lower quantities at each seed group solution being the controlled variable, distilled water containing no salt and used as a control, seeds of different variety, and paper towels to clean off any residue. Procedure:
Results Discussion: Our results for our soil salinization lab were that none of our seeds sprouted, possibly due to error. We may have used too much solute in all six of the test seeds, and our control definitely would not sprout as we used 3% solute in four of the solutions which was excessive for initial experimentation. The other two were decreased in solution with a 2% and 1% concentration being counterbalanced by the previous addition of solution. Some of the beneficial solutions in having a successful experiment would have been to place 1% or less in the seeds from the start so that there would be sprouting and germination. Based on our findings compared to other groups, the excessive amount of salt concentration could have been an essential element of change. A possibility would have been that salt denatured the enzymes for germination. Moreover, the seeds were covered up, yet the efficient way of to have growth would be placing the paper towel in the petri dish and then put the seeds on top so that way the seeds would absorb the water and germinate more efficiently. The amount of light and darkness was enough, but again the solute was just too much and prevented the germination process to cycle through. Critique: Some of the possible explanations for the unexpected results of our experiment would be the excess of NACI solution added to the seeds, having improper coverage of the seeds while waiting for results that would not give germination successfully, leaving water to evaporate from the solution, allowing salt to crystallize for too long, and accidently mixing in the incorrect solution. Conclusion:Due to the manner in which we performed our techniques, the seeds were prevented from germinating correctly, and growth was minimal to zero.
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