Briefly describe the results of water movement through xylem vessels in celery.

Water molecules are held together by polar covalent bonds. Since the oxygen atom is more electronegative than the two hydrogen atoms in water, the oxygen is negatively charged while the hydrogen atoms are positively charged. This allows every water molecule to hydrogen bond to four other water molecules. The attraction of water molecules to other water molecules is known as cohesion. 

The property of cohesion helps water to move up from roots to stem to leaves against gravity. As some molecules in the leaves escape as water vapor due to the process of transpiration, the rest of the column of water in the xylem tubes pulls on water molecules below it which helps pull the entire column of water up. Now, there is more room for water to enter the roots and be transported upward in the xylem tubes.

Water is also attracted to the lining of the xylem tubes. This is known as adhesion. By sticking to the lining of the xylem as well as to other water molecules, water is able to move up the celery stalk which is a stem even against the downward pull of gravity.