The field of biology covers many aspects of science. Therefore, many different science experiments can be created in many fields. Biology encompasses plant life, animal life, cellular biology, marine biology and biological processes. You do not need to use very complex experiments to investigate many biology subjects as many times items found in the kitchen can be used in the experiment.
Plant growth requires many different factors for optimal growth, which can be investigated using a variety of experiments. You can grow different species of the same plant in a controlled environment to determine which grows faster. Suggested factors that can be investigated include types of plant food, different soils, different amounts of water, the effect of salt in the water on growth, how the amount of sunlight or type of sunlight effects growth or how temperature can slow down or speed up growth.
You can use gelatin, beetroot slices or onion cells to see how diffusion works. Place the onion or beetroot on a disk. Mix some starch solution with iodine and place several drops on one side of the disk. See how the solution diffuses through the cells from one side of the onion or beetroot to another. See how temperature can affect the rate of diffusion by heating the beetroot or onion disks to different temperatures before adding the starch solution. You can also investigate how the surface area changes the rate of diffusion using gelatin blocks and red dye.
Test different food products to determine which has the most starch, vitamins, minerals, glucose, fats or protein. These tests include titrations, colorimetric assays and decolorization reactions. Determining the concentration of different components is important: individuals need to ingest specific amounts of minerals, proteins, fats, starch and vitamins to be healthy. Therefore, if you are deficient in one type of nutrient, you will need to take supplements or eat foods that are specifically high in the needed nutritional component.
Mold grows on all types of food, but different foods will produce different molds. You can design several experiments based on mold growth on foods. Investigate which foods grow different molds, as cheese tends to produce white mold while bread will have green mold. You can also investigate how temperature, time and moisture content effects mold growth. Typically colder temperatures prevent mold growth but not indefinitely. Attempt to discover the optimal factors for each food.
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