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Adequate means good enough. It means the same thing in a science experiment as it does in any other context.
The control is whatever you base your experiment on. No control = you can't compare your data to anything = good luck making sense out of your experiment. You aren't following the scientific method if there is no control.
A good science experiment is a holdable fireball. It is sort of difficult though, but this is the link http://video.about.com/chemistry/Handheld-Fireballs.htm
You need a control for any experiment. It doesn't sound like this particular experiment is of the utmost importance but it's a good habit to get into if you plan more important ones. I have no idea what the control would be.
Sweet or Sour, A Lemon Experiment