The Great Mold Race Life Science Experimental Investigation ___________________________________________Signature of Sponsoring TeacherSignature of School Science Fair Coordinator TeacherJasmine Wade640 W. Scott St.Chicago, IL 60610Grade 8 Table of ContentsAcknowledgments Page 3Purpose and Hypothesis Page 4Background Research Page 5Materials and Procedure Page 6Results Page 7Conclusion, Reflection, Application Page 8Reference List Page 9 AcknowledgmentsI would like to thank Mrs. Machado for letting me do this project even if it means not going to science fair. I would also like to thank my mom and dad for letting me attempt to grow mold inside of our house.
Purpose and Hypothesis This is project tested how mold grew on certain types of bread in different environments. My controlled variables were that both pieces of bread where in the same place, both pieces were sprayed at the same distance, and both pieces were inside of a plastic bag. My independent variable is the type of bread, which would be store bought or bakery. My dependent variable is the amount of mold on each piece of bread. My hypothesis was that the bakery bread would mold faster than the store bought bread. I thought this was because the store bought bread has more artificial ingredients and preservatives that could possibly render the growth of mold on the bread for a while. I also hypothesized that it the mold would grow better in a warmer climate. Review of Literature To be able to understand this experiment first you need to understand, what exactly is mold? According to Moldfacts.
com1 , “Mold (or mould) is a term used to refer to fungi that grow in the form of multicellular thread-like structures called hyphae. Fungi that exist as single cells are called yeasts. Some molds and yeasts cause disease or food spoilage, others play an important role in biodegradation or in the production of various foods, beverages, antibiotics and enzymes.” This basically means that mold is a type of bacteria. It can cause either harm or good. It’s in some of our foods such as cheese, yoghurt, and milk but it can also be a bad thing such as when it grows on our fruits and vegetables. Gross! There are actually different types of mold too.
There are over 100,000 different types of mold! Some are harmless but some are fatal to even be near. Penicillium is the type of mold that grows on bread and the type that will be grown in this project. Now that you know a little about mold you need to know how does temperature affect mold growth. The ideal temperature for mold growth is around seventy degrees fahrenheit, or twenty degrees celsius. Mold does not do well in cold environments and it will take a long time to grow. Before I started the experiment, I hypothesized that the bakery bread would mold faster than the store bought bread. I thought this was because the store bought bread has more artificial ingredients and preservatives that could possibly render the growth of mold on the bread for a while.
I also hypothesized that it the mold would grow better in a warmer climate. Materials and ProcedureProcedure:Buy all materials necessaryFill spray bottle with waterSpray both pieces of bread once at about 1-2 inches away from surfaceSeal bread in a plastic bag (Make sure it’s tight!)Store in a warm environment for optimal growthMake daily observations and take a photo each day. If the bread is dry use gloves and take out bread and spray once.
After about 2-3 weeks create a graph of how much mold was on the bread. (in cm3 )The materials I used for this project were: Six plastic bagsOne piece of wheat breadFour pieces of french bakery breadOne spray bottle Water ResultsResults So far none of the bread I have had in any locations has started to grow mold yet. Day Amount of growth (cm3)1None2None3None4None5None6None7None Conclusion, Reflection, and ApplicationReflection I would like to know something else now. While I was doing my research I saw on a video where a person put two foods in separate places the measured the amount of mold that grew on them and then they put them side by side and one of the foods sort of infected the other with mold and then the one that grew the mold slower the first time now grew the mold faster that time.Application This experiment can be used in real life because a lot of times my family buys both store bought bread and bakery bread. If we want to keep the bread for a while because we don’t need it then we would be able to refer to this experiment and see which bread preserves longer.
I would say that my experiment does explain how or why something works because it’s like when people do the McDonald’s burger versus a real burger that you make a home and obviously the real burger molds faster because it’s more natural while a fast food chain burger has things inside of it to keep it fresh for longer until people order it.Conclusion Since I was not able to get my results in time I cannot make a reliable conclusion. So far in my experiment the bread that is stored in a warmer environment, in which case would be my basement, has begun to show signs for growing mold. This means that mold is more likely to grow in environments that are warmer and can keep moisture such as my basement which is warm.