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The Biological Importance of Water.

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Introduction

The Biological Importance of Water Hyung-woo (Shane) Cho, L6GW What are the physical and chemical properties of water that make it so unique and necessary for living things? When you look at water, taste and smell it - well, what could be more boring? Pure water is virtually colorless and has no taste or smell. But the hidden qualities of water make it a most interesting subject. Most people will see water and think that it is very ordinary, as we are able to find water everywhere. It is written as H2O in chemistry, tasteless, transparent, liquid in room temperature, and made of hydrogen and oxygen. Water usually forms between 70~95% of the mass of the cell, and 75% of the earth is covered with water. Even though it seems to be the simplest and ordinary thing on the earth, it is also the most important and remarkable substance around us. Thinking about the importance of water becomes much easier when we imagine the life without water. Every life, cannot survive without it. This is because the scientists and spacemen are desperate to investigate if there is water on Mars, as it is the possibility of presence of life on Mars. ...read more.

Middle

in its structure forms hydrogen bonds with the water separating the molecules from each other. Water's properties as a solvent, cohesive and adhesive property are vital to life as most biochemical reactions such as respiration, blood plasma, and transpiration stream in xylem. Water as a solvent is also why cell cytoplasm contains about 90% water. The adhesive quality of water is related with capillary action, which can be seen in the experiment of placing a straw into a glass of water. When we place a straw into a glass of water, the water 'climbs' up the straw. What is happening is that the water molecules are attracted to the straw molecules. When one water molecule moves closer to the straw molecules the other water molecules (which are cohesively attracted to that water molecule) also move up into the straw. Capillary action is limited by gravity and the size of the straw. The thinner the straw or tube the higher up capillary action will pull the water. Plants take advantage of capillary action to pull water from into them, so that they can be able to use water and support themselves. Transpiration is the evaporation of water into the atmosphere from the leaves and stems of plants. ...read more.

Conclusion

The substance called water seemed to be so much simple and ordinary, however, writing this essay helped me to realize interesting property and qualities of water. Because of the hydrogen bonding, water is a good solvent, adhesive and cohesive. Water as a solvent allows from transport and transpiration system of animals and plants, to useful inventions such as soaps. Water works as an insulator because when it freezes the ice layers float on the water insulating the water below, with less change in temperature caused by heat capacity to make suitable aquatic environment. It also helps our body to maintain constant temperature because it has properties as a temperature stabiliser. Cohesive and adhesive property of water is vital for the transpiration stream and blood plasma to travel through the xylem and phloem vessels and blood vessels as well to transport water and nutrients. Finally, Photosynthesis and Respiration requires the use of water, because of its unique physical and chemical properties. In conclusion, water is the most important and unique substance on the earth since it has very wide range of biological, chemical, and physical properties that are vital for every life beings to live and continue. Without the presence of water, a single cell would not have survived and the life would not take place on this planet. ...read more.

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Most of the reasons why water is biologically important are covered. A little repetitive and lacking specific detail in places though.

Marked by teacher Adam Roberts 05/07/2013

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