The Role of Water in the Lives of Organisms Essay

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The Role of Water in the Lives of Organisms

Water is perhaps the most important molecule for the survival and life of all living organisms because there is a wide spectrum of roles that it plays. The fact that the earth's surface consists of 70.8% water shows its significance and importance. ======================================================================

Firstly, water has the chemical formula Hg0 (two Hydrogen atoms to one Oxygen atom), the covalent bonds between which create cohesive forces.

Water has a very high specific heat capacity, measuring 4,200 Joules, creating a stable environment for organisms to live in. This means that water does not heat up or cool down too rapidly
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This benefits both the aquatic plants as well as the higher order organisms that feed off these plants, as photosynthesis is the process where plants make their food. These sugars are transported to different areas of a plant in water.

Water functions as a transport medium in both animals (including humans) and plants. In humans, water is within the blood substance and because water molecules slide past each other easily blood can be easily transported through narrow capillaries. A vital role because if this were not the case, blood would not be able to transport bodily pigments (e.g. hormones, white blood cells, red blood cells, proteins etc) around the body as efficiently risking vast numbers of health problems. Water also allows waste materials such as urea and urine to be dissolved, transported and excreted, preventing them becoming toxic and harming the organism that has produced them during metabolic activities. A role in the transport of gametes in animals (e.g. sperm in semen) is aided by water, therefore important in fertilisation and the continuance of that specific species. In plants, water and mineral ions are transported through xylem vessels to replace water, lost from leaves in transpiration, and minerals necessary for growth. These properties aid transport and provide support of cells and the stem. Dissolved nutrients that plants

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