APFIVE A researcher investigated the effect of atmospheric CO2 concentration on plant transpiration. Two groups of identical plants were grown in separate chambers under identical conditions, except one chamber had an elevated CO2 level. The researcher expected elevated CO2 to decrease transpiration, but no significant difference was observed. Which of the following best explains this result?
The environmental conditions in the chambers were too stable, preventing the plants from exhibiting stress responses that would affect transpiration.
The plants used in the experiment were of a species known for its low sensitivity to changes in atmospheric CO2 levels.
The difference in CO2 levels between the two chambers was too small to elicit a measurable response in transpiration rates.
The researcher did not account for the fact that plants can adjust their stomatal opening in response to CO2 levels, potentially minimizing the expected impact on transpiration rates.
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