To test the hypothesis that plants grow faster in green light, a student set up 3 of the same type of plants. She placed the fir
st plant under a green light, the second plant under a regular light bulb, and the third plant under a red light. What is the dependent variable in this experiment?
The dependent variable is the speed of plant growth, and the-plant's general health and welfare.
The hypothesis is defective. It should talk about whether the plant is DEPRIVED of any green light. The way the experiment is described, the results won't be clear. The "regular" light bulb has a lot of green wavelengths in it, along with a lot of other stuff that the plant may or may not be interested in. So the plant's response to the green light AND the 'regular' light may be very similar.
