Correct Response: A. Water molecules (H2O) are polar and form hydrogen bonds between oxygen and hydrogen atoms on neighboring water molecules. This tendency of water molecules to "stick" to one another allows them to pull one another up through the roots and stem as water evaporates from the leaves of the plant. If the hydrogen bonds between water molecules are broken (B), water loses its cohesion and thus its ability to draw water molecules up through the plant. Water transport in plants does not involve temperature-induced changes in water density (C) or the high specific heat of liquid water (D).
