Jose noticed that two plants which his mother planted on the same day that were the same size
when planted were different in size after three weeks. Since the larger plant was in the full sun all
day and the smaller plant was in the shade of a tree most of the day, Jose believed the sunshine
was responsible for the difference in the plant sizes. In order to test this, Jose bought ten small
plants of the same size and type. He made sure they had the same size and type of pot. He also
made sure they have the same amount and type of soil. Then Jose built a frame to hold a canvas
roof over five of the plants while the other five were nearby but out in the sun. Jose was careful to
make sure that each plant received exactly the same amount of water and plant food every day.
Question: What was the variable being tested in Jose's experiment?
O the amount of plant food
O the amount of water
O the type of soil
O the amount of soil
O the amount of sunshine
O the size of pot