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Practical Biology - of an organism To keep life intact...

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Practical Biology Introduction Living things are made up of cells which form the basic unit of life. The cell is, in turn, made up of molecules and atoms. The cell usually cannot be seen with the naked eye. Each cell performs certain functions. Some functioning cells come together organize to form a tissue. It is at this stage that the complex structuring of living things begins. A group of tissues , when organized, form organs such as the brain , the heart, etc. When a number of organs work together, they compose an organ system . So an organism is a composite union of various organ systems. The combination of several organisms is called population , which, in turn, forms a community , leading to the creation of a Biosphere . Figure 1.1 represents the structural complexity of the Biosphere. i) Metabolism An organism is basically made up of six basic elements: C, H, O, N, P and Ca. These make up about 96% of the weight
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Unformatted text preview: of an organism. To keep life intact there is an exchange of chemical matter from cell to environment and environment to cell. Organic matter from the environment is absorbed by the cell and utilized for preparing energy. The energy thus prepared is used to perform the functions of the cell. Unlike in nonliving things, a number of physical and chemical changes take place in the body of the organism. The sum total of physical and chemical changes in an organism is called metabolism. Metabolism includes anabolism in which complex organic substances are built up and energy is stored, and catabolism in which the complex organic substances are broken down to release energy. These changes of conservation and release of energy continuously take place in the organism. This energy is basically in the form of chemical energy. Nonliving matter does not show this kind of exchange of energy....
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