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An Investigation To Show What Different Factors Affect The Growth & Germination Of Cress Seeds

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An Investigation To Show What Different Factors Affect The Growth & Germination Of Cress Seeds Introduction There are many different factors that could affect the germination of a plant. Here is a list of a few: CO2 concentration: This will affect both germinating seedlings and growing plants. Different concentrations of CO2 can cause plants to grow at different rates. Plants need CO2 in the air in to respire in the same way, as we need oxygen. Without it they would not be able to create energy so they couldn't grow. The problem with trying to monitor the affects that different amounts of CO2 would have on the cress seed is that it is hard to control the level of CO2. In school we do not have the equipment. Amount of water in the soil (assuming that it is grown in soil): This will affect both germinating seedlings & growing plants. Plants need water for the transportation of different molecules such as glucose. It is essential for growth. They do this by osmosis. With out water they would dry out & die. Water also makes germination easier because it softens the shell. Amount of light (Intensity, wavelength): Only growing plants need light in order to grow. Seeds don't need light because they are usually under ground when they germinate. Plants need light because this is how they get food. The sunlight gets trapped in the plants leaves by chloroplast cells and turned into energy. ...read more.


Of leaves on seedling, And any other observations. All this will do is make it easier to analyse my results. Prediction I predict that nitrogen is going to have the most devastating effect on the germination and growth of a plant. The reason I think this is because it converts sugars made by photosynthesis into protein. Protein is needed for growth. I think that they will be short and have yellowing leaves due to facts from my research. Research Mineral Used in Deficiency Magnesium Chloroplast Yellow leaves Nitrogen Chlorophyll cells and Amino acids Reduction in growth and yellow leaves Sulphur Amino acids and proteins Reduction in growth and yellowing leaves Fair test To get my results I watered my plants over a period of 2 weeks. An important aspect of my test was getting reliable results. This will help me to me evaluate my experiment fairly. To make my test as fair as possible I made sure all of my petri dishes were in the same conditions as each other. This meant that any effects could only be caused by the factor that I am experimenting with. We watered them all as regularly as each other, placed tem all in the same spot, made sure that they were all in the same temperature, light etc. I must also take into consideration the fact that anomalies could occur in my results or some of the effects could be caused by natural causes. ...read more.


The cress seeds in my experiment that are in a solution that lacks magnesium have the darkest leaves. This could be caused because the plants found that the Sulphur in the solution counter acted the effects of the lack of magnesium. Also it seems that the solutions did not effect the growth of the plants, they all seemed to grow to the same height at the same rate. This is proven by the control test also growing to this height. Sulphur had the greatest effect on the plants overall. By the 4th day into the experiment, the solution lacking sulphur was the only solution in which few seeds had germinated and had yellow leaves and short seedlings. I think that it is because sulphur is used in both germination and growth. It is used in proteins and Amino acids (the building blocks of protein). These are both vital nutrients as they are used as energy in the plant. Overall I think that if I had carried out my experiment for longer, the effects would have been greater. I could have also chosen more diverse nutrient/minerals. This would have caused fewer problems with 'which mineral caused which effect' and I would have seen greater effects. I did find out that magnesium causes a decrease in energy due to fewer chloroplast cells. Sulphur causes short term and long term effects in growth and causes yellowing of leaves and Nitrogen does not cause short term effects but I predict will slow growth and cause yellowing of leaves in the long run. ...read more.

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