In the case of peppered moth (Biston betularia), the black-coloured form became dominant over the light-coloured form in England during the industrial revolution. This is an example of from Biology Evolution Class 12 Nagaland Board
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Class 10 Class 12

In the case of peppered moth (Biston betularia), the black-coloured form became dominant over the light-coloured form in England during the industrial revolution. This is an example of

  • natural selection whereby the darker forms were selected

  • the appearance of the darker coloured individuals due to very poor sunlight

  • protective mimicry

  • inheritance of darker environment


A.

natural selection whereby the darker forms were selected

The given case in an example of natural selection. As a result of the struggle for existence only those organisms could survive, which have favourable variations to adapt environmental conditions on with so many variations in populations of species the struggle for existence results in survival of the fittest. The survival of the fittest is the result of selection and proliferation of only those organisms, which were most suitably adapted the environment and most successful in mating, ie, natural selection.

The given case in an example of natural selection. As a result of the struggle for existence only those organisms could survive, which have favourable variations to adapt environmental conditions on with so many variations in populations of species the struggle for existence results in survival of the fittest. The survival of the fittest is the result of selection and proliferation of only those organisms, which were most suitably adapted the environment and most successful in mating, ie, natural selection.

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

Founder Effect.
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When did life appear on earth ?

 500 million years ago.
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Give another name for origin of life from non living matter.

Abiogenesis
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