A student designed an experiment to determine if air temperature had an effect on the rate of photosynthesis in corn plants. A constant in this experiment is the A. Air temperature at which the corn plants were grown B. Amount of carbon dioxide used by the corn plants C. Volume of oxygen produced by the corn plants D. Number of corn plants used

The constant in this experiment refers to a factor that remains unchanged or consistent throughout the experiment. Considering the investigation aimed at determining the effect of air temperature on the rate of photosynthesis in corn plants, the constant in this scenario is: A. Air temperature at which the corn plants were grown

Explanation:

• The air temperature at which the corn plants were grown should be kept constant to ensure that the only variable being tested is the effect of changes in air temperature on the rate of photosynthesis. By maintaining a consistent temperature throughout the experiment, any differences observed in the rate of photosynthesis can be more reliably attributed to the variations in temperature being tested. Therefore, the temperature must remain unchanged as a constant to isolate the impact of temperature on photosynthesis.