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ORIGIN OF LIFE
By- LovnishThakur
Integrated Biotech
3rd sem
Presented To-
Dr. Pradeep Chaswal
Overview
• Facts
• Introduction
• Big Bang Theory
• Theories on Origin of Life on Earth
• Conclusion
Did You Know?
 The earth was formed around 4.5 billion years
ago
 It took ~500 million years for the crust to
solidify
 The oldest fossils of microorganisms are 3.5
billion years old
 Oxygen began accumulating in the atmosphere
about 2.7 billion years ago
Have you ever wondered how the first life
form on earth came into existence?
BIG BANG THEORY
According to this theory
 It is assumed that in the beginning, whole
energy of universe was concentrated at a point
 Due to a huge explosion- this energy got
distributed which formed the present day
universe.
Theories on Origin of life
 Theory of Creationism
 Theory of Extraterrestrial Origin
 Theory of Biochemical evolution
Creationism
Creationism
• Life was put here, on Earth, by divine forces
• This is based on faith, not fact
• It relies on stories that have been passed down
over the years
• Cannot be proven scientifically
Extraterrestrial Origin
This theory states that life originated
on other planets outside of our solar
system, and was carried here on a
meteorite, asteroid or comets
Carl Sagan
‘Comets give and comets take
away’
Biochemical evolution
Life appeared after a period of chemical
reactions
According to physical and chemical laws
Conditions on early Earth
No free oxygen (O2)
Free hydrogen (H2)
CH4, NH3 and H2O
Energy for chemical reactions come from
electric discharge in storms
&
solar energy
Miller and Urey in 1953
• Atmosphere above warmed sea water
that contained H2O, H2, CH4, and NH3
• Electrodes
that simulated
lightning
Result
After some days they obtained organic
compounds like amino acids(Protein) that
were collected in cooled water
Conclusion
Most relevant theory regarding the origin of
life is
‘Theory of Biochemical Evolution’
Because it is scientifically proven
But none of these theories is 100% correct
Research is still going on to unravel the
mystery of Origin of life
Reference
• www.livescience.com
• www.springer.com
• creation.com/origin of life
• M.space.com/25126-big-bang-theory
Origin of life

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Origin of life

  • 1. ORIGIN OF LIFE By- LovnishThakur Integrated Biotech 3rd sem Presented To- Dr. Pradeep Chaswal
  • 2. Overview • Facts • Introduction • Big Bang Theory • Theories on Origin of Life on Earth • Conclusion
  • 3. Did You Know?  The earth was formed around 4.5 billion years ago  It took ~500 million years for the crust to solidify  The oldest fossils of microorganisms are 3.5 billion years old  Oxygen began accumulating in the atmosphere about 2.7 billion years ago
  • 4. Have you ever wondered how the first life form on earth came into existence?
  • 6. According to this theory  It is assumed that in the beginning, whole energy of universe was concentrated at a point  Due to a huge explosion- this energy got distributed which formed the present day universe.
  • 7. Theories on Origin of life  Theory of Creationism  Theory of Extraterrestrial Origin  Theory of Biochemical evolution
  • 9. Creationism • Life was put here, on Earth, by divine forces • This is based on faith, not fact • It relies on stories that have been passed down over the years • Cannot be proven scientifically
  • 10. Extraterrestrial Origin This theory states that life originated on other planets outside of our solar system, and was carried here on a meteorite, asteroid or comets
  • 11. Carl Sagan ‘Comets give and comets take away’
  • 12. Biochemical evolution Life appeared after a period of chemical reactions According to physical and chemical laws
  • 13. Conditions on early Earth No free oxygen (O2) Free hydrogen (H2) CH4, NH3 and H2O Energy for chemical reactions come from electric discharge in storms & solar energy
  • 14.
  • 15. Miller and Urey in 1953 • Atmosphere above warmed sea water that contained H2O, H2, CH4, and NH3 • Electrodes that simulated lightning
  • 16.
  • 17. Result After some days they obtained organic compounds like amino acids(Protein) that were collected in cooled water
  • 18. Conclusion Most relevant theory regarding the origin of life is ‘Theory of Biochemical Evolution’ Because it is scientifically proven But none of these theories is 100% correct Research is still going on to unravel the mystery of Origin of life
  • 19. Reference • www.livescience.com • www.springer.com • creation.com/origin of life • M.space.com/25126-big-bang-theory