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

The Role of Water in Living Organisms

Extracts from this document...

Introduction

The Role of Water in Living Organisms Water is one of the most abundant substances on the planet. It can be found naturally in all three states; solid (ice), liquid (water), and gas (steam). However, chemically it is very unusual. For example, water molecules are slightly polar i.e. they have a positive and negative end. Due to this difference in electro-negativity the slightly positive charge on the hydrogen atom is attracted to the slightly negative charge on the oxygen atom in another molecule. This bond is called a hydrogen bond and is what causes the water to have its unusual properties. For example, other molecules of the same size of water (H2O) are all gases at room temperature and pressure (R.T.P). Without the hydrogen bonds, water too would be a gas at RTP and would have a boiling point of -120�C. ...read more.

Middle

This would not be possible if the water molecule was non-polar. As I have said, water is the most abundant molecule on the planet, but is also the most abundant molecule organisms. The lowest percentage composition is 20% in seeds, with the highest being 99% in jelly fish. Water plays a vital role in metabolism in all cells and photosynthesis in plants. All cells, whether plant of animal, water is used for hydrolysis (the breakdown of a substance by water). For example, the break down of polysaccharides to monosaccharides forming a glycosidic bond, which is used as a medium for chemical reactions. Water also has an important role to play in osmosis as for gaseous exchange to take place, a moist environment is needed. On a much larger scale it is used for transport. ...read more.

Conclusion

There are many reasons for such diversity of life. The water around living cells can act as a protective shield, preventing cells from drying out, as they would on land; it provides support and buoyancy so hard tissue and bones are not required in such large amounts; the temperature remains constant due to is high specific heat capacity and finally water filters out harmful ultra-violet rays from the sun. Water's role in life of any organism is due to its physical and chemical properties. They strange properties of water allow it to act as an excellent solvent, to provide an excellent support mechanism, due to the cohesive forces of attraction between the molecules being so strong and unlike any other liquids that it is virtually incomprehensible. Waters role in the life of any organism is of the up most importance. Without it life would simply not exist. Life began it water, and although some life evolved to live on land, it still relies entirely on the fantastic substance that is water. ...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)

    Water is arguably the most important biochemical of all. Water is essential to life itself, without water life on earth would not exist. Water is a major component of cells, typically forming between 70 and 95% of the mass of the cell. This means that we are made from approximately 60% water by mass.

  2. The Importance Of Water To Living Organisms

    These plants support aquatic food chains, and therefore animal life. It is also important to animals living in water for it allows them to see - their eyes depend on water's transparency to see. Water's colloid formation is also very important although quite unusual.

  1. The Waste Land by Eliot emphasises the themes of dystopia and apocalypse.

    a closed car at four � dry sterile thunder without rain � a damp gust Bringing rain � the limp leaves Waited for rain dry The opening verses of 'The Hollow Men' use images of dryness very similarly to 'The Waste Land'.

  2. The Role Of Water In Living Organisms

    gaseous exchange, which need to be moist as the exchange takes place in solution, therefore there is water in the lungs or in mesophyll cells in the 'spongy' part of leaf cells. It is also used on a much larger scale for transport.

  1. The role of water in living organisms.

    Water, takes up a large space in cells, which are the single components of the human body. This is a physical demonstration, of how water is essential for life to be happening. The structure of the cells themeselves is highly dependant upon the solvent properties of water.

  2. Water's Chemical Properties.

    At the interface between water and air is an ordered arrangement of water molecules which are hydrogen bonded to one another and the water below. The result is an interface surface or film under tension. Students can observe the surface tension of water by overfilling a glass of water to the point where water stands above the rim.

  1. Water and Marine Resources

    However the worldwide improvements in water supply through the use of village wells and pumps as well as plastic piping and storage containers mean that water is now collected, stored and transported. Even in relatively poor countries people may consume up to 200 litres of water each day.

  2. Monitoring the activity of a living organism.

    Additional light-trapping pigments, enzymes (organic substances that speed up chemical reactions), and other molecules needed for photosynthesis are also located within the thylakoid membranes. A chemical in plants called chlorophyll uses sunlight to convert carbon dioxide and water into carbohydrates and oxygen.

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