Question

multiple choice question
which variables should students control in order to design an experiment to test the amount of light on the ability of plants to produce sugar?
o the amount of water, light and temperature should be the same for all plants.
o the amount of light and the temperature in the room should be the same for all plants.
o the amount of water and the temperature in the room should be the same for all plants.
o the amount of light and the amount of water should be the same for all plants.

Explanation:

In an experiment testing the effect of light on a plant's ability to produce sugar, light is the independent variable. To accurately determine its effect, other factors like water amount and room - temperature that could affect plant growth and sugar - production should be controlled. Water and temperature are potential confounding variables. If they vary, it's hard to tell if changes in sugar production are due to light or these other factors.

Answer:

The amount of water and the temperature in the room should be the same for all plants.