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100 Project Ideas

By — John Wiley & Sons, Inc.
Updated on Feb 15, 2011

Agriculture

  1. What effect does the pH of soil have on plant growth?
      Independent variable: Soil pH
      Dependent variable: Plant growth
  2. What effect does soil pH have on the color of flowers?
      Independent variable: Soil pH
      Dependent variable: Flower color
  3. What effect does seed size have on the number of seeds that germinate?
      Independent variable: Seed size
      Dependent variable: Number of germinating seeds
  4. How does the surface area of soil affect evaporation rate?
      Independent variable: Surface area
      Dependent variable: Evaporation rate
  5. What effect does wind speed have on the evaporation rate of water from soil?
      Independent variable: Wind speed
      Dependent variable: Evaporation rate

Astronomy

  1. How does the position of the Sun in the sky during the day affect the length of Sun shadows?
      Independent variable: Position of the Sun (determined by passing of time measured in minutes or hours)
      Dependent variable: Length of Sun shadows CAUTION: Do not look directly at the Sun because it can permanently damage your eyes.
  2. How does the position of the Sun in the sky during the day affect the direction of Sun shadows?
      Independent variable: Position of the Sun (determined by passing of time measured in minutes or hours)
      Dependent variable: Direction of Sun shadows
  3. How does the amount of light pollution affect the visibility of stars?
      Independent variable: Amount of light pollution (design a scale such as 1 is almost no light and 10 is the lights of a large city)
      Dependent variable: Degree of visibility
  4. How does Earth's rotation affect the position of stars in a constellation in relation to one another?
      Independent variable: Earth's rotation (determined by passing of time measured in minutes or hours)
      Dependent variable: Star position
  5. What effect does the color of a material have on it absorption of solar energy?
      Independent variable: Color of material
      Dependent variable: Absorption of solar energy (measured by an increase in temperature)
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