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Note on Evolution

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About the origin of life, several hypotheses have been put forth. Some of them, with their short explanation, are given below.

  1. Theory of special creation
  2. Theory of spontaneous generation
  3. Modern concept of origin of life

Theory of special creation

According to this theory, on the earth, life was created by supernatural power, the god. This theory has no scientific evidence; therefore, it is not widely accepted.

Theory of spontaneous generation

According to this theory, life originated on the earth from the non-living things spontaneously. It was believed that the mud of Nile River could give rise to living creatures like frog, toad, snake and crocodile; when warmed in sun.

Modern concept of origin of life

Modern concept was suggested by opera in 1930 AD. According to this theory, the first living cell arose from simple elements. Micro-molecules like carbon, hydrogen, oxygen, nitrogen etc. united to produce macro-molecules like proteins, carbohydrates, enzymes, nucleic acids etc. Then they interact to produce the first living cell by a process called abiogenesis. Abiogenesis means development of living things from non-living matter.

  • Organic evolution is the process of gradual and orderly changes in organisms from one form to another.
  • According to Modern concept of origin of life theory, the first living cell arose from simple elements.
  • According to Theory of spontaneous generation, life originated on the earth from the non-living things spontaneously.
  • According to Theory of special creation on the earth, life was created by supernatural power, the god.
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Very Short Questions

The series of related and gradual changes in plants and animals which occur due to the continuous variation is called organic evolution.

The major evidences that support the theory of organic evolution are listed below:
a) Evidences from the study of fossils or paleontological evidence.
b) Evidences from comparative morphology and anatomy.
c) Embryological Evidences.
d) Evidences from the study of vestigial organs.
e) Evidences from the geographical distribution of organisms.
f) Evidences from the connecting links.

Evolution is defined as the series of changes which occur, each step depending on what has gone before.
Or, Evolution can be defined as the descent with the modification.

Homologous organs are those organs which have a similar embryonic origin and basic plan but different function. The forelimbs of whale, horse, man, bat and bird are homologous organs.When the wings of a bird or bat are compared with the wings of an insect, it is found that they have similar functions but different in basic plans, such organs are analogous organs.

Fossils give the information about the past organisms that came into existence on the earth as fossils are the remnants of them. Now technologies like carbon dating and uranium dating help to know their age also. Thus, we can find out time period at which they existed, the climatic condition of that period etc. By studying fossils scientists have traced the evolutionary history of animals like horses, dog, cats, camels and human beings too. So, fossils are the strongest evidences of evolution.

All animals and plants cannot be fossilized. They need to have the following properties for fossilization:
a) The organisms should have hard parts in their body.
b) The remains of organism should be buried quickly under a thick layer sediments over millions of years.

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  • What does the term evolution mean?

    gradual change over time
    change of any kind
    None of the above
    genetic off spring
  • The first step in organic evolution is ______.

    formation of organic molecules from inorganic molecules


    the creation of prokaryotic cells


    none of these


    presence of lightning and UV radiation


  • Which theory has no scientific evidence?

    Theory of spontaneous generation
    Modern concept of origin of life
    All of the above
    Theory of special creation
  • When was the opera suggested the Theory of Modern concept?

    1920 A.D


    1970 A.D


    1940 A.D


    1930 A.D


  • _______ means development of living things from non-living matter.

    Abiogenesis
    All of the above
    Spontaneously
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What will happen if there were no evolution on the earth?

What will happen if there were no evolution on the earth?


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Science

Is modern concept is organic evolution? if yes than, Was it given by opera or Louis Pasteur???


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evolution

What is evolution


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