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

Water is Essential for Life

Extracts from this document...

Introduction

Water is Essential for Life Water is one of the most commonly found molecules on planet earth and it exists as rivers, lakes and oceans. It is present as vapour within the air and surrounds plants and animals at all times, it are the habitat for many organisms. Obviously, water has an important role in biological life. It now makes up 60-90 per cent of the fresh mass of living organisms and consists whilst playing a large role within all or many cells. This essay refers to the many biological, chemical and physical features of water. It discusses the properties of temperature control, electrolyte balance, transport mediums, chemical reagents and health. A water molecule consists of an oxygen atom covalently bonded to two atoms of hydrogen. The two bonds form an angle of 105� but, because the oxygen bond is more electro-negative than hydrogen, the shared electron charge of the covalent bond is distributed more towards the oxygen, whilst the hydrogen atom has slightly positive charges making uneven charge distribution. This results in the molecule being polar and, because it is positive at one end and negative at the other, it is referred to as dipolar. ...read more.

Middle

This is especially important in cold climates and where there are cold seasons. Freezing can, however, also cause some damage to organisms exposed to a sub-zero temperature, this is because water expands when it freezes and it therefore would do so in cells. A lot of polar ectothermic species have 'anti-freeze' compounds like glycerol which prevent body fluids freezing even at temperatures below zero. This liquid is also is needed during osmosis to balance the concentration gradients on two sides of a cell. Osmosis is the diffusion of water molecule down the concentration gradient. It is used in osmoregulation to control the levels of water in the human in the kidneys, if water potential is high in one area and low in another it will determine the movement of water in or out of the cell. Water protects organisms from diseases. It is used to make mucus which filters the air we breathe in, preventing dusts and other unhealthy substances from entering our lungs. Water is used to make synovial fluid which is used in lubrication. The synovial fluid which is used as lubrication to stops the bones from grinding away. ...read more.

Conclusion

Male gametes swim through the water to female gametes during external fertilisation. Water is an important reagent in metabolic reactions, particularly in hydrolysis, and as a source of hydrogen in photosynthesis. Water is a key factor for hydrolysis to take place. It breaks hydrogen binds. Hydrolysis is used in digestion to break up carbohydrates and fats. From this essay we can learn that a water molecule is dipolar and covalently bonded between oxygen and hydrogen. Due to this polarity water can form hydrogen bonds, and when it bonds with other polar atoms the new molecule becomes a soluble. One of the properties of water is that it has high latent heat vaporization and when it cools it causes the solid form to float, acting as a good insulator. Another factor is that it helps to balance the concentration gradient of many substances, whether that is liquid or gas. A further point is that can be used in a mode of transport for most organisms. Finally, it is really impossible to imagine life without water. One has only to survey the vast deserts of the Sahara! Before knowing what life is in a draught or waterless situation. The properties of this molecule make it so essential for life on earth, and so it is each and every person's responsibility to make sure it stays clean and available. ...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. Marked by a teacher

    The roles water in living organisms and water as a habitat for organisms

    5 star(s)

    of a high percentage of water because once frozen the cell would be irreparably damaged. The freezing point of water is also lowered by solutes because the soluble molecules disrupt the hydrogen bonds making the water freeze at a lower temperature and it easier to melt ice.

  2. Marked by a teacher

    An investigation into the effect of a germination inhibitor on the germination of seeds.

    3 star(s)

    in the incubator, somewhere near to the Group 1 pots but not so near that they are not distinguishable as another Group. Call these pots Group 2. 6. And repeat again for the last 10 of the 30 pots and again place them again in the incubator (Note: where you

  1. Discuss the various adaptations of vertebrates that enable them to live in marine conditions.

    Chondrichthyes solve this problem by maintaining such a high concentration of urea in their blood (2.5% - far higher than the 0.02% of other vertebrates) that it is in osmotic balance with seawater. Teleost fishes have evolved a more complex and efficient kidney to cope with the hypertonic environment.

  2. Three separate experiments which are to be carried out to investigate a plant's unique ...

    Counting the Stomata Experiment: One of the factors affecting how much water is evaporated, and the rate of transpiration is the number of stomata. When I carried out the experiment, I did not find any stomata on the top side of the laurel leaf.

  1. Water's Chemical Properties.

    Water is one of the only compounds that possess these characteristics. An electrostatic attraction occurs between the polar water molecules. The slight positive charged hydrogen atom is attracted to the slight negative charged oxygen atom of another water molecule. This weak attraction is called a hydrogen bond.

  2. Investigation into the relationship between the density of fresh water shrimps in fleet brook ...

    There is no longer need to estimate when the reading lies between two graduation marks. To measure water pH level Digital pH meter Universal indicator Digital pH meter The digital pH meter will give an accurate qualitative pH reading to two decimal places.

  1. Investigation in to the effect of bile salts on the digestion of fat.

    Drawing of apparatus Safety During the course of the experiment it is imperative that the following safety checks are carried out. 1. 2. Standard laboratory safety rules must be observed. 3. Take care when working with mains voltage - equipment (laptops etc..)

  2. The effects of organic effluent from the seweage on the biodiversty in a freshwater ...

    The acidic weeds may also affect the readings as the weeds neutralise the alkaline water and may be responsible for the constantly changing of the pH readings. 3. The bank will be made of bricks and rapid leeching of the bricks may also provide unreliable pH reading.

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