Origin of life

2. 5 Ancient
Theories About The
“Origin Of Life”

3. 1. Theory of Special
Creation

4. 1.Theory of Special Creation
Father Suarez
Life was created by supernatural power.
According to Bible the world was created within six
days.
Adam – The first man
Eve – the first woman
According to Hindu mythology:
Brahma – God
Manu – The first man
Shradha – the first woman

5. 2. Theory of Spontaneous Generation
(Abiogenesis or Autogenesis)

6. 2. Theory of Spontaneous Generation
(Abiogenesis or Autogenesis)
Life originated from non living things in a
spontaneous manner.
Held by early Greek philosophers like Thales,
Anaximander, Xanophanes , Empedocles, Plato,
Aristotle, Etc.
Ancient Egypt believed that the mud of the Nile
could give rise to frogs, toads, sakes, mice and
even crocodiles when warmed by the sun.
Van Helmont – Human sweat and wheat grains
could give rise to organisms.

7. 3.Theory of Panspermia or Cosmozoic Theory
or Spore Broth Theory

8. 3.Theory of Panspermia or Cosmozoic Theory or
Spore Broth Theory
Ritcher - ‘Protoplasm’ reached the Earth in the form of spores or
germs.
Helmholz – ‘Protoplasm’ in some forms reach ed the Earth with
falling meteorites.
Arrhenius – Organisms existed throughout the universe and thir
spores, etc.
Evidence against Cosmozoic Theory:
Living matter cannot survive the extremely cold dryness and ultra-
violet radiation from the sun.
4.Theory of Eternity Of Life
Preyer - Living beings is always existed on the Earth and shall
continue to exist forever.
Evidence Against Theory of Eternity Of Life :
Earth had not always existed. If life is eternal, where did it exist this
planet was formed.

9. 4.Theory of Eternity Of Life

10. 5. Theory of Catastrophism
Georges Cuvier (Father of Paleonthology) – Cataclysms
(great distraction) or catastrophic (concerning disastrous
event) revolution occurs upon Earth from time totime which
completely destroys all organisms.

11. 7 Theories On the
Origin Of Life

12. 1.Panspermia
Panspermia
 Perhaps life did not
begin on Earth at
all, but was brought
here from
elsewhere in space,
a notion

13. 2.Simple Beginning
Simple Beginnings
 Life might have
begun with smaller
molecules
interacting with
each other in cycles
of reactions.

14. 3.RNA World
RNA World
 RNA store
information like DNA,
serve as an enzyme
like proteins, and
help create both DNA
and proteins. Later
DNA and proteins
succeeded this "RNA
world," because they
are more efficient.

15. 4.Chilly Start
Chilly Start
 Ice might have
covered the oceans
3 billion years ago,
as the sun was
about a third less
luminous than it is
now, scientists say.

16. 5.Deep Sea Vent Theory
Deep-Sea Vents
 Begun at submarine
hydrothermal
vents spewing key
hydrogen-rich
molecules.

17. 6.Community Clay
Community Clay
 The first molecules
of life might have
met on clay.

18. 7.Electric Spark
Electric Spark
 Lightning may have
provided the spark
needed for life to begin.
 Electric sparks can
generate amino acids
and sugars from an
atmosphere loaded with
water, methane,
ammonia and
hydrogen, as was
shown in the famous
Miller-Urey experiment