Thursday, November 28, 2019

The Biological Importance of Water Essay Example

The Biological Importance of Water Paper Using the physical and chemical properties of water molecules discuss the biological importance of water. Life on Earth began in water and evolved over the course of 3 billion years before being able to spread onto land. Water is the substance the allows for the existence of any life at all on this planet. It makes up 70% of the human body, and equally large proportions of other living organisms. It also covers nearly three quarters of the Earth’s surface, shaping the face of this planet and the course of evolution over millions of years. Water molecules are polar molecules due to the hydrogen and oxygen atoms that form this remain slightly positive (in the case of hydrogen) and negative (in the case of oxygen). These slightly positive and negative charges then form hydrogen bonds with oppositely charged atoms. This creates weak bonds with other water molecules, and hold the substance (water) together, which is called cohesion. This cohesion helps the transport of water and di ssolved nutrients against gravity in plants. When water evaporates from a leaf, the hydrogen bonds cause water molecules basically ‘stick’ to the sides of the veins in the leaf, which is called adhesion. Adhesion to the molecules in cell walls helps to counter the effects on gravity on the water, enabling it to be transported through water-conductive cells up to the leaves. This allows plants to provide nutrients for growth, water for photosynthesis, and ions for the maintenance of plant proteins (used for growth and creating amino acids) and preventing any ion deficiencies, keeping the plant healthy and allowing it to grow even more. Without this polarity of water molecules, water and dissolved nutrients would not be able to pass from the roots up to the leaves, meaning that plants as we know them would not be able to survive on Earth. Furthermore, water allows for life to be sustained by moderating surface and air temperature, as well as body temperature. We will write a custom essay sample on The Biological Importance of Water specifically for you for only $16.38 $13.9/page Order now We will write a custom essay sample on The Biological Importance of Water specifically for you FOR ONLY $16.38 $13.9/page Hire Writer We will write a custom essay sample on The Biological Importance of Water specifically for you FOR ONLY $16.38 $13.9/page Hire Writer

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