water on plant growth A scientist wants to study the effects of water on plant growth. He plans to give some plants more water than others. she plans to measure the height of the plants every day for two weeks. The scientist will only used pea plants. All the points in his experiments will receive the same amount of fertilizer and sunlight, kept at the same temperature, and will be planted in the same soil and same size containers. The scientist set up two groups in his study. One group of plants will receive a 0.5 cups of water. The other group will receive one cup of water. She plans to repeat his experiment three times.