Final answer:
The controlled variables in the experiment are Temperature, Light intensity, Type of plant, Size of container, and Duration of experiment. CO2 level to 1.000 ppm may serve as the independent variable, depending on the experiment's focus.
Step-by-step explanation:
In a scientific experiment, controlled variables are elements that are kept constant to ensure that the results are due to the independent variable and not other factors. In your list, the controlled variables that you will not change would be:
- Temperature
- Light intensity
- Type of plant
- Size of container
- Duration of experiment
The CO2 level to 1.000 ppm could be an independent variable if you are examining its effect on plant growth, whereas the other factors listed would be controlled to ensure a fair test. It's important in the experiment to maintain these controls consistently to gather valid data and draw accurate conclusions about the impact of CO2 on plant growth.