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

328.

The· eyes of Octopus and eyes of cat show different patterns of structure, yet they perform similar function. This is an example of

• homologous organs that have evolved due to convergent evolution

• homologous organs that have evolved due to divergent evolution

• analogous organs that have evolved due to convergent evolution

• analogous organs that have evolved due to divergent evolution

Industrial melanism is an

• effect of industrial pollution

• effect of mutation

• evidence of survival of fittest

• evidence of favour of natural selection

Archaeopteryx is a connecting link between

• pisces and amphibians

• amphibians and reptiles

• reptiles and birds

• birds and mammals