Multiple choice

If I increase my vitamin C intake, then I will have fewer colds. What is a controlled variable?

  1. Amount of vitamin C

  2. Number of colds

  3. Amount of times you come in contact with germs
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A controlled variable is a factor that must be kept constant so it does not influence the outcome of the experiment. Keeping the exposure to germs constant ensures that any change in the number of colds is due to the vitamin C intake rather than different levels of exposure.

Keep practicing — related questions