Water is normally the most abundant component of any living organism.
As most human cells are approximately 80% water and 60% of the human
body is made up of it, it is extremely important in many different
ways to both the survival and the well being of living organisms.
Evolutionists believe that life probably originated in water and even
today thousands of organisms make their home in it. Water also
provides the medium in which all biochemical reactions take place.
The importance of water to living organisms originates from its many
properties including its solvent properties, its high specific heat
capacity, its high latent heat of vaporization, its surface tension,
its density and freezing properties, its transparency and its colloid
Water has been called a universal solvent and its properties as a
solvent depend on the fact that it is a polar molecule:
As we can see from the diagram, charge is shared out unequally and so
water is said to have ‘polarity’. This means that water can weaken
the attraction between ions of the opposite charge, because as it has
both net positive and net negative charges itself, it attracts both.
An example of this is sodium chloride in water. Water is a good
solvent for many substances. Ionic solids, like salt and polar
molecules, such as sugar and amino acids, readily dissolve in it.
Ionic compounds dissolve in water with a shell of orientated water
molecules around each ion. Whereas soluble organic molecules, like
sugars, dissolve in water due to the formation of hydrogen bonds
between the water molecules and the slightly charge...
... middle of paper ...
...o large particles which would
settle out. The attraction of water by hydrophilic colloids causes
them to absorb water in a process called imbibition. It is this
process that causes dry seeds initially to absorb water.
As we can see water is an extremely complex and diverse molecule with
many different properties. I believe that water is extremely
important, if not one of the most important molecules, to living
organisms. Without it, we, as humans, and all other living organisms
could not survive. I think water is important to us as it performs
many different functions, it acts as a solvent, it insulates, it
provides a habitat for many creatures, it allows aquatic plants to
photosynthesise and many other things already mentioned here.
Therefore we can say that water is very important to all living
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