Name the various theories related to the origin of life? Explain any one of them? Ans. The origin of life has been explained through various theories as follows:
(a) Theory of special creation
(b) Theory of spontaneous generation (Abiogenesis)
(c) Cosmozoic Theory (Theory of catalysm or catastrophism)
(d) Catastrophe Theory (Mechanist theory)
(e) Theory of eternity
(f) Theory of biogenesis (Mechanist theory)
(g) Modern theory (The chemical origin of life)
A hypothesis of spontaneous generation of life on earth:
According to this theory, the origin of life was from lifeless or non-living substances, from which different types of animals and plants appear suddenly or spontaneously, without any apparent cause. This theory was quiet acceptable in the absence of scientific explanations. This theory was rejected, by the fact that the organism does not appear out of inanimate, lifeless objects.
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Following are the different kinds of theories related to the life's origin given by different scientists -
1. Theory of Special Creation.
2. Theory of Panspermia.
3. Theory of spontaneous generation.
4. Chemical evolution's theory.
The description of the panspermia theory is given below :
The Greek people in early times proposed or gave this theory. According to this theory, it is believed that many spores came suddenly from the outer space and landed on Earth. These spores then formed or got converted into various living forms.
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