There are two opposing views about origin of modern man. Accordin

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 Multiple Choice QuestionsMultiple Choice Questions

71.

Which of the following is not vestigial in man?

  • Tail vertebrae

  • Nails

  • Nicitating membrane

  • Vermiform appendix


72.

Pneumatic bones are expected to be found in

  • house lizard

  • flying fish

  • pigeon

  • tadpole of frog


73.

Presence of tail in a child is an example of

  • atavism

  • divergent evolution

  • convergent evolution

  • mutation


74.

Mesozoic era is Golden period of

  • reptiles

  • Mollusca

  • fishes

  • amphibians


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75.

There are two opposing views about origin of modern man. According to one view Homo erectus in Asia were the ancestors of modern man. A study of variations of DNA however suggested African origin of modern man. What kind of observation on DNA variation could suggest this?

  • Greater variation in Africa than in Asia

  • Variation only in Asia and no variation in Africa

  • Greater variation in Asia than in Africa

  • Similar variation in Africa and Asia


C.

Greater variation in Asia than in Africa

There are two models about the origin of modern man (Homo sapiens):

(i) Multiregional model- As per this model, modern humans evolved in different parts of the model from regional descendents of Homo erectus who disapperared from Africa about 1- 2 mya (million years ago).

(ii) Monogenesis model- As per this model, African descendents of Homo erectus gave rise to modern humans.

According to an experiment by some scientists in late 1980s, mtDNA (mitochondrial DNA) of >100 people was studied from 4 different continents. Greater the difference between th mtDNAs of two people, the longer ago it diverged from a common source. They concluded that divergence of mtDNA of Africans began about 200,000years ago. Therefore, there are greater variation in Asia than in Africa.


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76.

Which have not left any evidences of organic evolution

  • Archaeopteryx

  • Cow

  • Peripatus

  • Neopilina


77.

In Ornithine cycle, which of the following wastes are removed from the blood?

  • Urea and urine

  • Ammonia and urea

  • CO2 and ammonia

  • CO2 and urea


78.

Organs which differ in origin but perform similar functions

  • analogous

  • homologous

  • vestigial

  • all of these


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79.

Which one of the following phenomena supports Darwin's concept of natural selection in organic evolution?

  • Development of transgenic animals

  • Production of 'Dolly' the sheep by cloning

  • Prevalence of pesticide resistant insects

  • Development of organs from 'stem cells' for
    organ transplantation


80.

Which one of the following experiments suggests that simplest living organisms could not have originated spontaneously from non-living matter?

  • Microbes did not appear in stored meat

  • Larvae could appear in decaying organic matter

  • Microbes appeared from unsterilized organic matter

  • Meat was not spoiled, when heated and kept sealed in a vessel


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