On one plant, set the light and air to high, and water to 40 mL. On the other plant, set the light and air to high but set the water to 0 mL and then 20 mL. Do you notice any patterns? Explain.

Now investigate the effect of air. Change the amount of carbon dioxide that one plant gets. What do you observe?

What happens when you set all plants to the same setting, but vary the amount of light?

Parker investigated how the amount of sunlight affects plant growth. Using his data below, calculate the average growth of each plant. Assume that each plant was provided 20 mL of water per day.

Which conditions favored the most growth?

Answer the question based on the above table

Which plant had the least growth? What can you infer from those results?

Answer the question based on the table.

How do the results relate to what you observed about the needs of plants? What other factors could affect plant growth?