What structure of the guard cells allows them to expand outward instead of spherically when inflated with water?

Name: What structure of the guard cells allows them to expand outward instead of spherically when inflated with water?
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Quizplus · Accepted Answer

Guard cells have thick inner walls that border the stomata and thin outer walls that are in contact with epidermal cells. This unequal cell wall thickness allows for the cells to expand outward and curve into a kidney shape when inflated with water.

What Structure of the Guard Cells Allows Them to Expand