A water molecule could move all the way through a plant from soil to root to leaf to air and pass through a living cell only once. This living cell would be a part of which structure?

A water molecule could move all the way through a plant from soil to root to leaf to air and pass through a living cell only once. This living cell would be a part of which structure? 






A) the Casparian strip
B) a guard cell
C) the root epidermis
D) the endodermis
E) the root cortex






Answer: D


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