Do the same types of mold grow on all types of bread?.Does eating breakfast have an effect on school performance? Does it matter what you eat?.How does the pH of juice change with time? How does temperature affect the rate of chemical changes?.Does storage temperature affect the pH of juice?.How does sugar concentration vary in different brands of apple juice?.Do oranges gain or lose vitamin C after being picked?.
Does the level of vitamin C in orange juice change over time?.Do different brands of orange juice contain different levels of vitamin C?.What plastic wrap best prevents oxidation?.What type of plastic wrap best prevents evaporation?.Does the presence of cigarette smoke affect the growth rate of plants?.Do plant-based insect repellents work as well as synthesized chemical repellents?.You can look at the percentage of seeds that germinate or the rate at which seeds germinate. How do different factors affect seed germination? Factors that you could test include the intensity, duration, or type of light, the temperature, the amount of water, the presence/absence of certain chemicals, or the presence/absence of soil.Does using colored mulch have an effect on a plant? You can look at its height, fruitfulness, the number of flowers, overall plant size, the rate of growth, or other factors as compared to plants mulched with non-colored mulch or not mulched at all.You can test different fertilizers to see how they affect the height of a plant, the number or size of its leaves, the number of flowers, time until blooming, branching of stems, root development, or other factors. How do different fertilizers affect the way plants grow? There are lots of different types of fertilizers containing varying amounts of nitrogen, phosphorus, and potassium in addition to other ingredients.What is the effect of a chemical on a plant? Factors that you can measure include rate of plant growth, leaf size, life/death of the plant, color, and ability to flower/bear fruit.How close does a plant have to be to a pesticide for it to work? What factors influence the effectiveness of a pesticide (rain/light/wind)? How much can you dilute a pesticide while retaining its effectiveness? How effective are natural pest deterrents?.How does cold storage affect the germination of seeds? Factors you can control include the type of seeds, the length of storage, the temperature of storage, and other variables, such as light and humidity.Is a seed's growth potential affected by its size? Do different size seeds have different germination rates or percentages? Does seed size affect the growth rate or final size of a plant?.How close can another plant grow to a sweet potato? What effects does an allelochemical have on a plant? Sweet potatoes release chemicals (allelochemicals) that can inhibit the growth of plants near them. How are plants affected by the distance between them? Look into the concept of allelopathy.Does magnetism affect the growth of plants?.How effective are natural mosquito repellents?.Are night insects attracted to lamps because of heat or light?.
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