Theories on the origin of life

• According to this theory, seeds travel through asteroids, meteorites, comets.

  Panspermia theory
• According to this theory, Life formation on the earth may have been taken place due to supernatural or divine forces.


  Special creation
• There are two types of concept in special creation, and those are:

  A) Hiindu concept

  B) Christian and Islam concept

  
• In Hindu concept, the whole world, plants, oceans, rivers, humans, animals are created by Lord Brahma.
• In Christian and Islam concept, God created the universe, human beings, plants, oceans and rivers in six days.
• The term panspermia comes from the Ancient Greek 'pan' meaning all and 'sperma' meaning seed.
• Theory of panspermia states that life on earth is originated from microorganisms present in outer space.
• This means seed everywhere.

  Panspermia
• Enumerate.

  A) Lithopanspermia

  B) Ballistic panspermia

  C) Directed panspermia

  
• Impact-expelled rocks from a planet's surface serve as transfer vehicles for spreading biological material from one solar system to another.

  Lithopanspermia
• the intentional spreading of the seeds of life to other planets by an advanced extraterrestrial civilization, or the intentional spreading of the seeds of life from Earth to other planets by humans.

  Directed panspermia
• impact-expelled rocks from a planet's surface serve as transfer vehicles for spreading biological material from one planet to another within the same solar system.

  Ballistic panspermia
• Identify the type of meteor.

  A) Meteoroid

  B) Meteorite

  C) Bolide

  
• According to this theory, basic organisms that gradually evolved into more complex ones over eons were the first lifeforms to emerge from the primordial soup.


  Abiogenesis
• The theory of abiogenesis was proposed by?

  Thomas Henry Huxley
• the deep-sea vent theory postulates that life may have originated at submerged hydrothermal vents spewing components essential to life, such as carbon and hydrogen.
• This theory states that life may have evolved from non-living matter as association with prebiotic molecules under primitive earth conditions, became more and more complex.

  Spontaneous Origin
• This theory suggests that life could come from nonliving things, decaying and rotting matter like straw, mud, etc.

  Spontaneous Origin
• Two people who tested the Spontaneous Origin:

  A) Francesco Redi

  B) Louis pasteur