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EVOLUTION


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ORGANIC EVOLUTION



       The word organic evolution is made up of two words ‘organic’ which means ‘living organisms’ and ‘evolution’ which means ‘unfold’. So, organic evolution is the unfolding of the process of formation of different types of organisms. As we see that there are millions of different types of animals and plants around us. All these forms of life came into existence from very simple unicellular organisms such as blue green algae which were produced in the oceans. With the passage of time these unicellular organisms modified themselves so that they can adapt themselves with the changing environment. These modification or variations were then passed on to the next generations, which resulted in the formation of new species of organisms. Thus according to the concept of organic evolution, the present day animals and plants have been evolved by a process of gradual change in the earlier simple forms of life, which took place in millions of years. This process of evolution is very slow and it is going on still today. But due to its slow rate we are not able to observe it.

Evidences for Organic Evolution

       The concept of organic evolution is not a hypothetical concept. It can be proved by taking some evidences which indicates the occurrence of organic evolution. These evidences are:

  1. Homologous organs
  2. Analogous organs
  3. Vestigial organs
  4. Atavism
  5. Connecting links
  6. Fossils
  7. Embryology



Test Your Understanding and Answer These Questions:




  1. What do you understand by evolution?

  2. Give various evidences in support of theory of organic evolution.