Chapter - 1.4

Speciation and Human Evolution

Speciation :- Formation of new species of plants and animals is the effect of evolution.

>food

>habitat

>Reproductive

>Genetic variatio is responsible for formation of new species

>Also geographical / reproductive isolation leads to speciation

Human evolution :- The biodiversity that is known today has been said to formed from very simple unicellular organasim due to evolution.

>Dinousours disappeard 7 years crore ago.

>Monkey like animal (Ancestors)

>Tail of monkey like animal of Africa disappeard -4 crore years ago.

Remain ape like animal stayed in Africa

>Gorilla and Chimpanzee evolved about 2.5 crore years ago

>Evolution of 2 crore years old species of apes

>The first human like animal erect posture evolved 2crore years ago

>Ramapithecus-First record of human like animal –East Africa

>Ape grown up in size become intelligent ape of South Africa – 40 lakh years ago

>Homo -20 lakh years ago

>Erect posture human like walking -15 lakh years ago

Existed in china and Indonesia of Asian continent.

>Upright Man -1lakh years ago

>Homo sapiens -50 thousand years ago

>Neatherland Man considered first example of wise man

>Cro –Magnon -50 thousand years ago

> Wise Man started practice agriculture 10 thousand years ago

>Art of writing -5000 years ago

>Modern Science – 400years ago

>Industrial society established -200 years ago