• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

The Biological Significance Of The Properties Of Water.

Extracts from this document...


The Biological Significance Of The Properties Of Water The human body 15% lipids, 12% proteins but by far the biggest % is water which makes up a massive 70% of the human body. This is the equivalent of 49kg in an average male adult human of mass 70kg. This is a good indication of just how important water is in the human life. Without water we would not be able to life and Earth is therefore the only planet in this galaxy with life as we know it except for Mars where ice has been discovered so water may have been present once. Water is a polar molecule, meaning that it has a positive and a negative pole. This is due to the fact that the water is an oxygen atom covalently bonded to 2 separate hydrogen ions to fill its outer shell by sharing electrons. However in the oxygen nucleus there are 8 protons but there is only 1 in each hydrogen nucleus. This results in the 2 shared electrons being slightly more attracted to the oxygen nucleus than the hydrogen nuclei. ...read more.


In a pond small insects such as pond skaters which are relatively dense can float on the water and live on the surface of the water. Without the tension such organisms would have no habitat and would die. Water also acts as a good temperature buffer to stabilise experiments within cells. Due to the hydrogen bonds produced bonds between the water molecules water is given the following properties relating to heat and temperature :- 1. Relatively high heat capacity 2. Relatively large latent heat of vaporisation 3. Relatively large latent heat of fusion These three properties are very similar and basically mean that a relatively large amount of energy required to change the temperature or state of water. The specific heat capacity of water is 4184J/kg, over 40 times that of sodium chloride. This means that a lot of energy is required to change the temperature of water and it is that fact that makes this property very useful in enzyme action. Enzymes in cells only work well in certain temperature ranges and if their temperature increases too much they become denatured and they won't work. ...read more.


This makes the cell more efficient which is important. When water freezes it becomes ice. Most substances become denser when they become a solid but water is at its densest state at 4�C. When it freezes it expands and becomes less dense. In Biology, this provides many arctic animals with a safe habitat under the ice which floats on the surface of the water because it is less dense. Under the ice the animals are protected from some predators and the environment is kept constant and insulated which helps them maintain a constant body temperature. The ice floats on the surface tension of the water and provides other animals with a place to live. If the ice sank to the bottom then the water would freeze from the bottom and eventually there would be no water left and many animals would die. In conclusion, water is very important to human life and all other organisms as it is evident that without it many would become extinct. It is the fact that water is polar and has hydrogen bonds that give it the properties described and it is these properties that make water so indispensable to life as we know it. Matthew Driver AS Biology ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Green Plants as Organisms section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Green Plants as Organisms essays

  1. Investigating thegrowth of pleurococcus on tree trunks

    (O-E) � ? E North X = ? (O-E) � ? E = ? (103 - 87.5)( ? 87.5 X = 2.75 South X = ? (O-E) � ? E = ? (98 - 87.5)( ? 87.5 X = 2.75 East X = ?

  2. The Biological Significance of Water.

    Water expands on freezing, this make ice less dense than water so it floats on top of ponds and lakes, providing insulation to organisms in the water below

  1. Explain The Significance To Organisms of Water As a Transport Medium and Habitat, In ...

    are made up of positive and negative ions. Sodium chloride is held in its structure by the strong attraction between the positive sodium ions and the negative chloride ions. Normally these ionic attractions require a large amount of energy to break, but when the compound is placed in water; due to water's polar nature the negatively charged oxygen

  2. The chemical nature and biological significance of the water molecule

    means that large amounts of heat energy are needed to evaporate even small amounts of water. The release of this energy is the driving force behind the world's weather systems. In addition, this property helps to keep the body temperature of living organisms constant, since a large amount of heat can be dissipated by vaporizing a small amount of water.

  1. The Biological Significance of Water.

    When substances are in solution, the molecules and ions can move about freely, thus making the substance more reactive then if solid. Therefore, the majority of cell reactions occur in aqueous solutions.

  2. The properties and biological importance's of water to living organisms.

    of water, when compared to similar compounds such as H2S (hydrogen sulphide - gaseous at room temperature), sulphur being in the same group as oxygen in the Periodic Table. The diagram, illustrates the polar nature of the water molecule. The H and O represent hydrogen and oxygen atoms respectively, and

  1. Water's Chemical Properties.

    It is present in varying amounts in the atmosphere. Most of the living tissue of a human being is made up of water; it constitutes about 92% of blood plasma, about 80% of muscle tissue, about 60% of red blood cells, and over half of most other tissues.

  2. What is the biological significance of water?

    While it exists on earth in all three basic states, solid, liquid, and gas, water's properties are often bizarre by most standards. For example liquid water contracts when cooled until it reaches a temperature of about 4 degrees Celsius where it reaches its maximum density.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work