Question

in conducting a test on the kind of music that may encourage plant growth, what practice upholds the fair test standard? using different kinds of plants giving some plants more water than others exposing the plants to different types of music using nutrient - rich soil for one and plain soil for others

Explanation:

In a fair test, only the variable being tested (type of music) should change. Other factors like plant - type, water amount, soil quality should be kept constant. Exposing plants to different types of music is the correct variable manipulation for this test.

Answer:

C. exposing the plants to different types of music