One science project for sixth-graders lets students study the effects of moisture on mold growth by placing bread in plastic bags and adding differing amounts of moisture to the bags. The student then observes the rate of mold growth when bread is dry, moist or wet.
To do the experiment, the student labels three plastic zip bags with the words “dry,” “moist” and “wet” and places a slice of bread into each bag. In the “dry” bag, the student places a piece of dry bread, while in the “moist” bag, he places a piece of bread sprinkled with water. For the “wet” bag, the student dips a piece of bread into a bowl of water and adds it to the bag. The student seals all three bags.
The student places all three bags on a disposable aluminium tray and stores the tray in a warm place outside the home, leaving the tray undisturbed for a period of 10 days. Each day, the student charts the growth of mold on the bread. On the tenth day, the student observes the growth, noting how moisture affected the growth of the mold and which slices of bread experienced the most and least mold growth. The student turns to scientific principles to note why the mold grew more rapidly on some slices and less rapidly on others.