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If you want to know how plants grow differently depending on the light, you should make sure they are all watered the same, have the same soil and are kept at the same temperature.
==Key Stage 3==
===Meaning===
[[Control Variable]]s are all the conditions of an [[experiment]]t that are kept the same.
===About Control Variables===
: Changing more than one [[variable]] in an [[experiment]] makes it impossible to tell which [[variable]] caused the [[result]]s.
: [[Control Variable]]s ensure that only the [[Independent Variable]] could be responsible for a change in the [[Dependent Variable]].
: [[Control Variable]]s make sure an [[experiment]] is a [[Fair Test]].