Which one of the following is the most primitive ancestor of man?

• Homo habilis

• Australopithecus

• Ramapithecus punjabicus

• Homo neanderthalensis

152.

Which one of the following ancestors of man first time showed bipedal movement

• Australopithecus

• Cro-magnon

• Java ape man

• Peking mann

The important gas which was absent during the formation of Earth is

• oxygen

• hydrogen

• nitrogen

• carbon dioxide

Homo erectus evolved during

• Oligocene

• Pliocene

• Pleistocene

• Miocene

Mammals have originated from which of the following

• Pisces

• Amphibia

• Reptilia

• Aves

Bursa fabricius is an important organ of birds. This organ is associated with

• generation of basophil

• production of uric acid

• metabolism of fatty acids

• generation of B-cell

Variation in gene frequencies within populations can occur by chance rather than by natural selection. This is referred to as

• genetic flow

• genetic drift

• random mating

• genetic load

The process by which organisms with different evolutionary history evolve similar phenotypic adaptations in response to a common environmental challenge, is called

• natural selection

• convergent evolution

• non-random evolution

• adaptive radiation

The tendency of population to remain in genetic equilibrium may be disturbed by

• random mating

• lack of migration

• lack of mutations

• lack of random mating

According to Darwin, the organic evolution is due to

• intraspecific competition

• interspecific competition

• competition within closely related species

• reduced feeding efficiency in one species due to the presence of interfering species