A student is studying the effects of sunlight on tomato plants. She chooses 6 tomato plants, making sure that each of them receives the same amount of water and fertilizer each day, She gives one plant 0 hours of sunlight each day, with the other 5 plants receiving 1, 3, 5, 7, and 9 hours of sunlight. At the end of the experiment, she has people try a tomato from each plant and has them rank the fruits by their sweetness. She also records the total number of leaves produced on each tomato plant. Which variable was controlled in the experiment? (1 point) Responses amount of water amount of water number of leaves number of leaves hours of sunlight hours of sunlight sweetness of fruit

Answer 1

In the experiment, the controlled variable is the amount of water and fertilizer given to each tomato plant. The student ensured that each plant received the same amount of water and fertilizer each day, which helps to isolate the effect of sunlight on the plants.