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Biology Internal Assessment Soil pH

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Biology Internal Assessment Lab Question: In this experiment we will investigate how the moisture of the soil affects the growth of the Viola tricolor. Hypothesis: The soil that is closer to the nearest water has more moisture, meaning that the Viola tricolor that grow there have more access to water which leads me to believe that the Viola tricolor that grow there are taller than the ones that grow in the dry soil areas. Variables Units Range Independent Distance from water Meters Moisture (<5m) Dry (>10m) Dependent Moisture in the soil Grams Controlled The amount of soil collected in each case Milliliters 50ml Extraneous Time of day, weather, season (autumn) Apparatus: * Calculator * Scale * Ruler * 10 tubes/beakers * 10 flowers (Viola tricolor species) * Meter stick Ways of treatment: In order to collect moisture soil: 1.) Collect the soil that is 1 meter away from water. 2.) Collect the soil that is 2 meters away from water. 3.) Collect the soil that is 3 meters away from water. 4.) Collect the soil that is 4 meters away from water. 5.) Collect the soil that is 5 meters away from water. In order to collect dry soil: 1.) ...read more.


Weight of dry soil (grams) 11 2.34 12 2.76 13 2.35 14 2.85 15 2.64 Height of Viola tricolor in dry area (cm) Height of Viola tricolor in moisture area (cm) 14.4 14.7 13.6 14 13.7 14.3 14 14.6 12.3 15.2 Overview: It can be clearly seen that the Viola tricolor that grew near the moisture soil was taller than the one which grew in the relatively dry soil. I decided to present my data in the following way using a line graph for each case instead of cramping it all onto one graph, because it is much easier to see the changes happening in each one of them. I had to manipulate data in one way or another, because initially I was given the weight of the tube+soil, and in order to get the weight of the soil alone I simply found out how much the tube weighted, and then subtracted that from the results I got previously for the tube+soil. Ex.) The tube weighted 10.7 grams Tube + soil weighted 13.9 grams. In order to get how much the soil weights alone I would do the following math: 13.9 - 10.7 = 3.2 grams Conclusion: My hypothesis turned out to be right after all; the Viola tricolor that grows in the moisture soil is taller than the one that grows in the dry soil which supports the results that I got. ...read more.


This was due to the time of day, because usually during morning hours the ground and grass is quite wet. In order to make my experiment fair I would have had to wait for the soil to dry up meaning that I should have conducted the experiment during the evening/afternoon instead of doing it in the morning. Another problem I encountered was that it was quite hard to measure how much soil you collect each time into the beaker, because sometimes also with the soil came little pieces of rocks and other unneeded things. Even though I did regulate this by collecting 50 ml of soil into the tube each time I'm sure that I still had more and less soil than I thought I did and this might have made the experiment less fair. Suggestions and improvements: 1.) In order to collect the same amount of soil next time I should use an apparatus like a mini shovel, similar to the ones children use when playing in the sandbox, which can only fit a certain amount of substance in it. 2.) Do it during evening/afternoon to make sure that not all of the soil is affected by the morning dew. 1 In How Water Affects Plant Growth. [Online]. [Cited on 27th September]. Available from world wide web:<URL: http://www.gardeningknowhow.com/children-in-the-garden/how-does-water-affect-plant-growth.htm> ?? ?? ?? ?? Andrey.M 28th September 2009 ...read more.

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