Aquaporins allow water to cross the membrane more quickly than it could otherwise, allowing cells to equilibrate with their environment. With fewer aquaporins, the cells would take longer to equilibrate.
Work Step by Step
Think of aquaporins as doors to a large theater. If you reduced the number of doors in the theater, it would take the crowd of theatergoers longer to enter or exit the theater. Theatergoers, in this analogy, are like water molecules.