7th grade science project ideas


Science Fair Project: What effect does yeast have on the decomposition of apples, bananas and bread?

This science fair project is an excellent example of a scientific experiment that tests a variable on a process. The variable is the yeast and the process is the decomposition of several different foods.

The bible mentions Leaven which is a soft, dough-type medium kept from one bread baking session to another. Each time someone baked bread, a small portion of this dough was used to start or leaven each new lot of bread dough. Leavening mixtures for bread making were formed by natural contaminants in flour such as wild yeast and lactobacilli, organisms also present in milk.

Research later revealed that yeast is actually a tiny microorganism, visible only with a microscope. The chemical action and growth of yeast that causes dough to rise then became apparent. Yeast is a tiny fungus, a microorganism which are egg-shaped cells that can only be seen with a microscope. It takes twenty billion yeast cells to weigh one gram.

Yeast cells digest food to obtain energy for growth. Yeast likes sugar in its various forms such as beet or cane sugar, honey, maple syrup and maltose.

In order to do this science fair project you will require two slices from a banana, an apple and from a loaf of bread each about 3 cm. long, You will need six small plastic sandwich bags. About two tsp of dry yeast. You should also have a spoon and a knife. You will need tape and a suitable marker to label each one of the bags. A pen and a log book or pad should be available to record observations.

A camera would be a good idea to take pictures of your entire project.

This project will give all the details you will require to do the science fair project.

CLICK HERE for complete details on this project... and to order.



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