Students results will vary. Teacher should construct a data table on the board in which students' results are written. As a math extension, have students construct a bar graph or box plot and have students calculate mean, mode, and range. Defend your answer. Students should draw conclusions that match their data but are likely to observe a decrease in carbon dioxide.
Plants take in carbon dioxide during photosynthesis and release oxygen.
Some of the carbon dioxide is stored in the plant and some of it is released back to the air during plant respiration. On a separate page name one variable in this experiment that you could investigate in a follow up experiment. Describe how you could carry out this experiment. Variables may include types of plants, size of plants, number of plants, size of jar, amount of sunlight, length of experiment. Allow students to do their own investigation.