Science Exit Project free essay sample

For my science exit project I decided to do a project that revolves around bacteria. I was suggested to do a project where I get a petri dish containing my oral bacteria and see the effects of liquid on my oral bacteria. I was very curious about this topic and wanted to know how the bacteria grows so I gave it a shot. For my project, I was told to make an â€Å"if and then† hypothesis. My hypothesis was that â€Å"If I put orange juice on a petri dish containing my oral bacteria then the bacteria on the petri dish will multiply. † For this experiment, I gathered all the materials I needed in front of me. Water, orange juice, strawberry juice, petri dishes, pipette, sterile cotton swab, tape, and a plastic bag. After I got all the materials I needed, I started working on my experiment. First, I swabbed my mouth with the sterile cotton swab. We will write a custom essay sample on Science Exit Project or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page After I obtained my oral bacteria, I opened the petri dish and started swabbing the petri dish with my oral bacteria. Then I closed it and secured it with tape. I did the same for the other two petri dishes. I searched the house for a warm dark place but due to some problems the heat wasn’t working. Having nowhere else to place the petri dishes, I placed the petri dishes in the cabinet and got my fur jacket to keep the petri dishes warm. I checked the petri dishes daily. During the first three days I saw no results whatsoever. However on the fourth day I finally saw some results. On petri dish #1 there was two tiny white dots. On petri dish #2, I saw 3 tiny dots. On petri dish #3 I saw a big white dot. Each day that I noticed new observation, I would record them on my data table. The petri dishes seemed to grow at about the same rate. However, during the first week petri dish #2 seemed to grow bacteria at a faster rate than the others. Once the week was over, I grabbed my materials again. I poured the orange juice, strawberry juice and water into separate cups. I got my pipette and transported a drop of each liquid on each petri dish. I closed the petri dishes again and left them in a warm dark place. Because the smell was getting really bad I decided to put the petri dishes in a plastic bag. I left the petri dishes in a warm dark place. While I was doing my project, I realized that the petri dish containing orange juice was growing bacteria at a faster rate than the other petri dishes. The petri dish containing water was growing bacteria at the slowest rate. In conclusion, my hypothesis was correct. I put orange juice on a petri dish containing my oral bacteria causing the bacteria to multiply. I am not positively sure if orange juice can make bacteria multiply. I could have done something wrong. I went over the whole process (in my head) and thought of what could be the possible sources of error. I remembered that in the beginning of my project, I didn’t turn the petri dish upside down when I placed the petri dishes in the fridge which caused condensation to form. This could have also started the bacteria growth. I also remembered that I forgot to leave the petri dish in room temperature for an hour which could have cause a delay to the bacteria’s growth. Due to some circumstances, the heat in our house wasn’t working. That made the room temperature colder than the usual. The temperature in where bacteria grow the best is at 100 degrees. If I were to redo this experiment, I would do some things differently. I would have put the petri dish upside down to prevent condensation. I would also make sure that my house is in room temperature so the it cant affect the bacteria growth.