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Evolution

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Biology

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Biology

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12

Which one of the following statement is correct?

  • Stem cells are specialize cells

  • There is no evidence of the existence of gills during embryogensis of mammals

  • All plant and animal cells are totipotent

  • Ontogeny repeats phylogeny


D.

Ontogeny repeats phylogeny

Recapitulation theory or Biogenetic law states that ontogeny (development of embryo) is recapitulation of phylogeny (ancestral sequence)

Recapitulation theory or Biogenetic law states that ontogeny (development of embryo) is recapitulation of phylogeny (ancestral sequence)


What is the phenomenon called when the original drifted population becomes founders?

Founder Effect.

Give another name for origin of life from non living matter.

Abiogenesis

When did life appear on earth ?

 500 million years ago.

Arrange the following substances in a proper sequence with regard to the formation of chemical constituents at the time of origin of life :

Sugar, methane, nucleic acid and amino acid.


Methane—sugar—amino acid—nucleic acid.

What conditions were created by Miller in his experiment?

Miller  created electric discharge in a closed flask that contained CH4, NH3, H2 and water vapour at high temperature like 800°C