How old is Universe
20 bya
______ comprises the Universe
Huge cluster of galaxies
How old is earth
4.5 bya
What were released from molten mass covered the surface of earth
Water vapour, methane, CO2, NH3
Life appeared
500 m yrs after earth
4 bya
Panspermia
Who?
What?
Units of life called?
Fav idea of?
+Early greek thinkers
+Units of life got transferred to. different planets including earth
+ Spores
+Astronomers
Theory of spontaneous generation
•belief
•proved wrong by
Theory of biogenesis
•life comes from
•pre-sterilised flasks
Open air flasks
*life came from decaying and rotting material like mud straw
*Louis Pasteur
*Life comes from pre existing cells
*Life did not come from killed yeast
*New living org arose from killed yeast
Life from pre existing non living org molecules chemical evolution
* Proposed by
*Molecules like
*Life formation was proceeded by
*Oparin of Russia and haldane from England
* Rna protein etc
*Chem evolution
*condition on earth
*Similar cond created by
*Electric discharge in a closed flask containing
*Obs formation of
*What aa
*In similar exp, others obs
*Ratio of ch3:NH3:h2
*1st life
- high temperatures, volcanic storms, reducing atmosphere containing (ch4, NH3)
- American scientist, SL Miller in 1953
*Closed flask containing ch4 h2 NH3 and water vapour at 800°C
*Formation of amino acids
(AAG) Alanine aspartic acid glycine
*Sugar, nitrogen bases, pigment and fats
*2:1:2
*Water
1st non cellular forms of life
They were?
3 bya / 3000 mya
Rna protein pollysaccaride
1st cellular forms of life
Which habitat?
2 bya / 2000 mya
Water ( aquatic)
1st auto trophic org
Chemo autotrophs
Never released O2
Theory of special creation
1.
2.
3.
- All living org were created as such
- Diversity was always same since creation and will remain same in future
- The earth is about 4000 years old
Sea voyage
Sea voyage
*Ship
*By
* Conclusion
- HMS beagle
- Charles Darwin
- Existing living forms share similarities to varying degrees not only among themselves but also w life forms that existed mya
