Question

Two students are testing the amount of fertilizer that would best promote the growth of strawberries in a garden. Which of the following is a controlled variable?



amount of fertilizer


growth of the strawberries


number of leaves


type of soil

Answer 1

Controlled variable is what stays the same throughout the whole experiment. What stays the same would be the type of soil you use.

Answer 2

It would be the type of soil that is used because that won’t change at all during the experiment