A) Lamarck
B) de Vries
C) Darwin
D) Mendel
Correct Answer: C
Solution :
Darwin gave theory to explain organic evolution. The main postulates which formed the basis of Darwins theory were-over production, limited resources, struggle for existence, variations, survival of the fittest (natural selection) and formation of new species. As a result of struggle for existence only those organisms could survive which have favourable variations to adapt environmental conditions or with so many variations in populations of species the struggle for existence results in survival of the fittest (term coined by Herbert Spencer). According to this, giraffe exhibited variations in the length of their neck and legs, both long neck and legs, short neck and legs containing giraffes were present but due to survival of the fittest, long neck and legs containing giraffes became abundant and giraffes with short neck and short legs became extinct.
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