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 number of leaves produced on each tomato plant.
Which variable was controlled in the experiment?
a. hours of sunlight
b. number of leaves
c. amount of water
d. sweetness of fruit
1 answer
The variable that was controlled in the experiment is:
c. amount of water
The student ensured that each of the tomato plants received the same amount of water and fertilizer each day, making it a controlled variable. The hours of sunlight, number of leaves, and sweetness of fruit are not controlled but rather measured or varied in the experiment.
