What control group could you add to this experiment? (photosynthesis)?

Another test question that i didn't know /:





It was like a beaker with water and a plant inside of it. They measured the distance from the light source and the number of gas bubbles produced.





the question was what was a good question to investigate in the experiment,


and a control group you could add.|||Well, you need something to compare the beaker with water and the plant inside of it to.


So, how about a beaker without a plant inside of it?


Your question will be, "Does the presence of the plant have an effect on the number of bubbles produced?





Another comparison could be made to a plant in the water that has foil over it to prevent it from being exposed to the light.


The question for this would be does the presence of light have an effect on the number of bubbles produced?|||There are several things you could be testing for, but a possible control group would be to have everything the same, except no light source, and measure the number of gas bubbles produced. The question would be if light impacts the gas bubbles.