Aquaporins: a. play an active role in the regulation of water movement in the xylem during mild drought b. are proteins embedded in the cell walls that transport water c. play an active role in the regulation of water movement outside the xylem during mild drought d. are proteins embedded in the mesophyll and bundle sheath apoplast that transport water
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The correct option that describes the role of aquaporins is b. "are proteins embedded in the cell walls that transport water." While aquaporins play an important role in regulating water movement, they are actually integral membrane proteins that facilitate the transport of water across cell membranes, not the cell walls.