why use a control in experiments?

Answer 1

In any experiment, the goal is to detect any effect of certain factor on a specific item or activity. so in order to be sure that the effect of that item observed in the experiment was done by the factor under study not by any external factors we must use control in which the same environment and conditions of the experiment are applied except the factor under study.

For example if the same effect was observed in both the experimental and control test tubes that's mean that the factor under study has no effect on the item because the same result was observed even in control tube were the factor under study is not exist

Answer 2

Hi:

Controls in experiments is to make sure that your experimental parameters are fine and that they are not interfering with your results. For example, if you are testing the activity of an enzyme on an unknown substrate, you have a positive control (enzyme with a known substrate) to make sure that your sample is active as expected and a negative control (enzyme with an unrelated substrate) to make sure that your enzyme is maintaining it's specificity.

Controls give you confidence in your results and make your experiment more valid.

Hope this helps. Cheers!!!

Answer 3

when you use a control you now have a baseline, a starting point, to compare the rest of your results to.

This is common practice in most if not all experiments.

Answer 4

To be sure all reagents and the technique used will supply a correct answer as the control does.

Answer 5

for compairison u need a basic level that is control
u can see difference in two categories i.e control and other i.e trial effect of experiment

other thing u can use it remove biass and effects which are not due to expariment