Air with varying amounts of CO₂, within the ranges found in nature, is forced across leaf surfaces and into sub-stomatal cavities; this produces closure of the stomata.

Question

Quizplus · Accepted Answer

This observation supports only Hypothesis II which states that the closure of stomata is triggered by high levels of carbon dioxide within the sub-stomatal cavities. It does not support Hypothesis I which suggests that the closure of stomata is triggered by the hindrance of photosynthesis due to high concentrations of CO2 in the air spaces around the leaf.

Air with Varying Amounts of CO2, Within the Ranges Found

Air with Varying Amounts of CO₂, Within the Ranges Found