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Class 10 Class 12

Jurassic period of the Mesozoic era is characterised by

  • gymnosperms are dominant plants and first birds appear

  • radiation of reptiles and origin of mammal like reptiles

  • dinosaurs become extinct and angiosperms appear

  • flowering plants and first dinosaurs appear


A.

gymnosperms are dominant plants and first birds appear

Jurassic period is the second geological period of Mesozoic era. In this period, the gymnosperms were dominant and the plants included ferns, cycads, Ginkgo, rushes and conifers. Among animals, important invertebrates included ammonites, corals, brachiopods, bivalves and echinoids. Reptiles dominated the vertebrates and the first flying reptiles the pterosaurs appeared.
The first primitive bird, Archaeopteryx, also made its appearance.

Jurassic period is the second geological period of Mesozoic era. In this period, the gymnosperms were dominant and the plants included ferns, cycads, Ginkgo, rushes and conifers. Among animals, important invertebrates included ammonites, corals, brachiopods, bivalves and echinoids. Reptiles dominated the vertebrates and the first flying reptiles the pterosaurs appeared.
The first primitive bird, Archaeopteryx, also made its appearance.

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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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When did life appear on earth ?

 500 million years ago.
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What is the phenomenon called when the original drifted population becomes founders?

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

Abiogenesis
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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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