Multiple Choice QuestionsWhich of the following structures is homologous to the wing of a bird?
Wing of a moth
Hind limb of a rabbit
Flipper of whale
Flipper of whale
Following are the two statements regarding the origin of life
I. The earliest organisms that appeared on the earth were non-green and presumably anaerobes.
II. The first autotrophic organisms were the chemoautotrophs that never released oxygen.
Of the above statement which one of the following options is correct?
II is correct but I is false
Both I and II are correct
Both I and II are false
Both I and II are false
The process by which organisms with different evolutionary history evolve similar to a common environmental challenge is called
natural selection
convergent evolution
non-random evolution
non-random evolution
The tendency of population to remain in genetic equilibrium may be disturbed by
random mating
lack of migration
lack of mutations
lack of mutations
According to Darwin, the organic evolution is due to
intraspecific competition
interspecific competition
competition within closely related species
competition within closely related species
Select the wrong statement:
the viroids were discovered by D.J. Ivanowski
W.M. Stanley showed that viruses could be crystallized
The term 'contagium vivum fluidum' was conined by M.W. Beijerinek
The term 'contagium vivum fluidum' was conined by M.W. Beijerinek
The wings of a bird and the wings of an insect are:
homologous structures and represent divergent evolution
analogous structures and represent convergent evolution
phylogenetic structures and represent divergent evolution
phylogenetic structures and represent divergent evolution
Industrial melanism is an example of
Neo Darwinism
Natural selection
Mutation
Mutation
Evolution of different species in a given area starting from a point and spreading to other geographical areas is known as
Adaptive radiation
Natural selection
Migration
Migration
A.
Adaptive radiation
The diversification of an ancestral group into two or more species in different habitats is called divergent evolution. When this involves large number of species to occupy different ritches, this is called adaptive radiation. Adaptive radiation is the process of evolution of different species in a given geographical area starting from a species of animals or plants and literally radiating to other areas of geography (habitats). Darwin's finches represent one of best examples of this phenomenon. Australian marsupials are another example of adaptive radiation.
| Convergent Evolution | Divergent Evolution |
| Eyes of Octopus and mammals | Bones of forelimbs of vertebrates |
| Convergent Evolution | Divergent Evolution |
| Thorns of Bougainvillia and tendrils of Cucurbita | Wings of butterflies and birds |
| Convergent Evolution | Divergent Evolution |
| Bones of forelimbs of vertebrates | Wings of butterfly and birds |
| Convergent Evolution | Divergent Evolution |
| Bones of forelimbs of vertebrates | Wings of butterfly and birds |
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