Biology (NTSE/Olympiad)  

7. Heredity & Evolution

Significance Of Variations

Significance Of Variations
Some of the neutral variations function as preadaptation to changing environment. For example, heat wave may kill most bacteria except a few which have a pre-adaptation or variation to tolerate high temperature.
Evolution :
Variations are raw materials for evolutionary processes. Picking up suitable variants by nature or environment forms the basis of evolution.
Struggle for Existence :
Useful variation provide advantage to the individuals in the struggle for existence and hence survival in nature.
Individuality :
Variations provide a distinct identity to each and every individual.
Artificial Selection :
Picking up of certain variations by breeders have resulted in development of a number of breeds and varieties of domesticated plants and animals


NTSE Biology (Class X)

NTSE Biology (Class IX)


NTSE Physics Course (Class 9 & 10)

NTSE Chemistry Course (Class 9 & 10)

NTSE Geography Course (Class 9 & 10)

NTSE Biology Course (Class 9 & 10)

NTSE Democratic Politics Course (Class 9 & 10)

NTSE Economics Course (Class 9 & 10)

NTSE History Course (Class 9 & 10)

NTSE Mathematics Course (Class 9 & 10)