Stomata normally open and close throughout the day; however, if unable to close, plant tissues could be damaged as

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Stomata are responsible for regulating the exchange of gases (carbon dioxide and oxygen) and transpiration (water loss) in plants. If they are unable to close, water will rapidly escape causing dehydration, which can lead to damage in plant tissues. Excess carbon dioxide reaching toxin levels within the leaf or oxygen escaping creating hypoxia within the leaf tissues are not directly related to stomata not being able to close.

Stomata Normally Open and Close Throughout the Day; However, If