Theories on Nature and origin of Life uploaded By Abdul Qahar Buneri student of M.Sc Zoology at ABDUL WALI KHAN UNIVERSITY MARDAN (Buner Campus)

2. Topics: Nature and origin of life
Evidence of evolution (Molecular,
Embryological and paleantological)
Presenting to: Sir, Shahroz Khan
PresenteR: ABDUL QAHAR
Buner Campus

3. Nature and Origin Of Life
The origin of life is a scientific problem which is not yet solved.
There are plenty of ideas, but few clear facts.
Verse….
Do not the Unbelievers see that the heavens and the earth were joined
together, then We clove them asunder and We got every living thing out
of water. [21:30]

4. introduction
 It is presumed that the universe came into existance with
a single titanic explosion called big bang about 15000
million year ago.
 The fragments of the fire ball expanded and cooled to give
rise to many celestial bodies.
 This results in the formation of solar system consisting of
sun and planets.
 The Earth originated about 4.6 billion years ago.
 Earlier life was thought to be created by some super
natural power.
 Origin of life on Earth is also called protobiogenesis.

5. • Mechanistics
Life arise from inorganic compounds controlled By
Some Natural Law
Materialistic
Life arise from Organic Compounds…

7. It is also called as autobiogenesis.

8. Theory of biogenesis :
 Francisco Redi, Spallanzani and Louis
Pasteur.
 This theory could not explain first life on
earth but able to explain continuty of life.
 Living organisms are always produced from
pre-existing living forms by reproduction
and not from non-living or lifeless matter.

10. Modern self-assembly theories
 Modern self assembly theory holds that
protobiogenesis occurred due to inherent
property of chemical molecules of self
organization or self assembly.
 This theory include conversion of micro
molecule into macro molecules to cell like
microsystem.
 First demonstration was provided by
Schmitt (1956) who has synthesized
collagen from simple micro molucules.

11. Cosmozoic Theory / Panspermia
Life’s origins did not originate on Earth,
but originated elsewhere in the universe.
The cosmozoic theory is that life on
earth originated in outer space.
It tells that some spores came from
the universe to earth containing life.
Then the creatures formed. But this
theory disputed .

12.  Life on earth came from different planet in the form
of spores or microorganisms.
 This is called cosmozoa or panspermia which were
preserved inside meteorites.
 These meteorites struck into barren earth to release
cosmozoa and help in development of various creature.

15. Catastrophism (proposed by French zoologist Georges Cuvier)
is a geologic theory which states that Earth changed by sudden,
violent processes. It states that the appearance of new fossils in
each rock layer resulted from other species' moving into the area
from elsewhere after each catastrophic event.
Its contrasting argument, uniformitarianism (proposed by English geologist
Charles Lyell in the 1830s), states that Earth changes slowly over long
periods of time by uniform processes such as erosion.
Theory of Catastrophism

16. Catastrophism Theory was rejected because according to this theory
new spp will produce which is not true….
Fossils….

20. Undersea Thermal Vents
• Life originated deep
beneath the surface of
the ocean at deep sea
hydrothermal vents.
• These vents release hot
gaseous substances from
the center of the earth
 Found ecosystems thriving in the depths of the ocean.
 Because life had been found to exist where it previously
was thought unable to, many scientists began to ask questions
as to whether or not this was where life may have originated
on the earth.

24. Special Theory of Creation
Day1: Media primia
Day2: Moulted Shape
Day3: Ancestors of plants
Day4 & 5: Animals
Day6: These animals were specializes and in that
specialization first Human (ADAM) was made.
According to this theory women was formed from
12th rib of first man (ADAM) .

34. Creationism
• The word "creationism" is used to
describe all groups who believe
that a supernatural being created
the universe.
• Scientific Creationism - the belief
that the account of creation in the
early chapters of Genesis is
scientifically as well as religiously
valid and that it can be supported
by scientific evidence apart from
scriptural authority.

35. Abdul Qahar Buneri abdulqahar045@gmail.com
www.slideshare.net/abdulqahar045

36. Ya Allah, Thank you for not giving me what I wanted
because I know You will surely give me what I need!!!!
{A Q}
Questions ??????