ï»¿ An important evidence in favour of organic evolution is the occurrence of from Biology Evolution Class 12 Nagaland Board

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An important evidence in favour of organic evolution is the occurrence of

• homologous and vestigial organs

• analogous and vestigial organs

• homologous organs only

• homologous and analogous organs

A.

homologous and vestigial organs

An important evidence in favour of organic evolution is the occurrence of homologous and vestigial organs. Homologous organs are those which have the common origin and are built on the same fundamental pattern but they perform different functions and have different appearances e.g., whale's flipper, bat's wings, cat's paw, horse's front leg, bird's wing, ox's front leg and human hand.
Vestigial organs in animals are those having no function now, in them, but had important functions in their ancestors.
Analogous organs are quite different in fundamental structure and embryonic origin but perform the same function. The study of analogous organs illustrates the occurrence of convergent evolution.

An important evidence in favour of organic evolution is the occurrence of homologous and vestigial organs. Homologous organs are those which have the common origin and are built on the same fundamental pattern but they perform different functions and have different appearances e.g., whale's flipper, bat's wings, cat's paw, horse's front leg, bird's wing, ox's front leg and human hand.
Vestigial organs in animals are those having no function now, in them, but had important functions in their ancestors.
Analogous organs are quite different in fundamental structure and embryonic origin but perform the same function. The study of analogous organs illustrates the occurrence of convergent evolution.

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

Abiogenesis
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When did life appear on earth ?

500 million years ago.
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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$°\mathrm{C}$
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What is the phenomenon called when the original drifted population becomes founders?

Founder Effect.
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