Amount of Water vs. Height of Plants Temperature vs. Amount of Sunlight Amount of Water vs. Amount of Soil Amount of Sunlight vs. Height of Plants
I gave my students this multiple choice question: Students measure the effect of water on the growth of plants for a lab experiment. The students give different amounts of water to three different groups of plants. All plants receive the same amount of light and are planted in the same amount of soil. The students then measure the height of the plants over a period of four weeks. Which variables should be labeled on the axes to graph the data collected in this experiment?

Only one answer is correct among these 4 choices:
- Amount of Water vs. Height of Plants
- Temperature vs. Amount of Sunlight
- Amount of Water vs. Amount of Soil
- Amount of Sunlight vs. Height of Plants

Could you tell me which one is correct?

Amount of Water vs. Height of Plants