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Chemistry · Chemical principles involved in experiments: Enthalpy of solution of CuSO4, Enthalpy of neutralization of strong acid and strong base, Preparation of lyophilic and lyophobic sols, Kinetic study of the reaction of iodide ions with hydrogen peroxide at room temperature

Janet thought that plants needed light and oxygen to grow. She set up four jars

Janet thought that plants needed light and oxygen to grow. She set up four jars as shown to test this idea. Which jars would be necessary to test her idea?

  • A. \( w \) and \( x \) only
  • B. Wand Y only y
  • C. \( W, X \) and \( Z \) only
  • D. W, Y and Z only

Step-by-step solution

To test if both light and oxygen are needed for plant growth, the experimental setup must include a positive control with both factors (jar W), a negative control with neither (jar Z), and a jar with oxygen but no light (jar Y). Comparing jar W and jar Y tests the necessity of light (since both have oxygen, only light differs). Comparing jar Y and jar Z tests the necessity of oxygen (since both lack light, only oxygen differs). This set allows us to determine that both factors are required for growth.
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