Question

8. Jill conducted an experiment to investigate which plant food would make her

plants grow faster. She tried four different plant foods on plants of the same
type and age. Jill concluded that the plant that was fed Brand A grew the
fastest. Jill did not realize that the plant that was fed Brand A also received
more sunlight. (SC.7.N.1.5.3)
What error did Jill make in her experiment?
a) She used the wrong kind of plant.
b) She used too much plant food.
c) She did not control the variables.

Answer 1

c) She did not control the variables.

In her experiment, Jill did not take into account the fact that the plant that was fed Brand A also received more sunlight. This means that there is another variable, besides the plant food, that could have affected the growth rate of the plant. By not controlling this variable, Jill's conclusion that Brand A was the best plant food may not be accurate. To properly control variables and make a valid conclusion, Jill should have ensured that all plants received the same amount of sunlight, or use other methods to control this variable as well.

Answer 2

the answer is cccccc