Which one of the following choices is not a function of water?
a. carrying food through the digestive system
b. transporting nutrients to cells and tissues
c. serving as a shock absorber and cleaning agent
d. providing caloric energy in the body

The answer is d. providing caloric energy in the body.

Through the process of elimination, the function of water is not to provide caloric energy in the body. The gram calory (cal) is the amount of energy that is needed to raise the temperature of water by 1°C. The energy is released in the chemical reactions. However, water has no enough energy to raise the temperature to itself. Oxygen and hydrogen atoms in the molecule of water are connected by hydrogen bonds which are much weaker than covalent or ionic bonds.  Thus, by breaking hydrogen bonds the small amount of energy is released.

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