One Would Expect to Find the Highest Density of Aquaporins

Question

One would expect to find the highest density of aquaporins in which of the following?
A)the plasma membrane of guard cells
B)the pits of a tracheid
C)the plasma membrane of parenchyma cells in a ripe fruit
D)the plasma membrane of a mature mesophyll cell in a leaf
E)the membrane lining plasmodesmata

Accepted Answer

Aquaporins are channels that specifically facilitate the transport of water across the plasma membrane. Guard cells are specialized cells found in the epidermis of leaves and stems that regulate gas exchange and water loss in plants. As such, one would expect guard cells to have a higher density of aquaporins to allow for rapid transport of water during stomatal opening and closing.