LIVING WORLD

ERNST MAYER (1904-2004) 


  • Born on 5 july 1904, kempton, Germany.
  • The Harvard University evolutionary biologost who has been called " The Darwin of 20th century" .
  • He joined Harvard's Faculty of arts and science in 1953 and retierd in 1975, assuming the title of Alexander Agassize Professer of zoology Emeritus.
  • Throughout his nearly 80- year career, his research spanned ornithology, taxonomy, zoogegraphy, evolution, systematics, and the history and philosophy of biology.
  • He almost single-handedly made the orgine of species diversity.
  • He also poineered the curently accepted definition of a biological species.
  • He was awarded the three prizes widley regarded as the triple crown of biology  (1) The bazen Prize in 1983.
     (2) The International Prize for Biology          in 1944. 
(3) The crafoord Prize in 1999.

WHAT IS LIFE ?
Life is unique, complecated organisation of biomolecules, that shows different chemical reaction resulting in activities like growth, reproduction, development, metabolism, responsiveness & adaptation.

CHARECTERSTIC OIF LIVING FORMS :-
1. Growth :- 
Increase in body mass and increase in number of individual are twin charecteristic of growth.
All living organism grow. (it is a charecteristic of living systems. A dead organism does not grow.)
* in plants, this growth by cell division occurs continiously throughtout their life span.
*In animals, this growth is seen only up to certain age. However cell division occur in certain tissue to replace the lost cells.

*Unicellular orgsnism also grow by cell division.
e.g., once can easily observe in vitro culture by simply counting the number of cells under the microscope.

* In majority of higher animals and plantds, 

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