TNPSC VAO Science Study Material In Tamil PDF Download

Deal Score-1

TNPSC VAO Science Study Material In Tamil PDF Download

The aim of biology is to explain the living world in terms of scientific principles. Aristotle, the great Greek philosopher and teacher, is known as the father of biology and the French naturalist, Jean Baptiste-de Lamarck, was the first to used the word  ‘biology’ in 1800. Biology today is subdivided into numerous branches based on the molecule, the cell, the organism and the population.

Multicellular animals are called Metazoa which have been divided into two branches: Parazoa and Eumetazoa.

In Parazoa, the body of animal is made up of loose cells, have poorly differentiated tissues and have no organ or digestive cavity. E.g sponges.

In Eumetazoa the cells are properly arranged into tissues and organs. It is further classified on the basis of (a) the number of germ layers present in the embryo; (b) the symmetry of the body of the organism; and (c) mode of origin of mouth. Those animals which have two germ layers in the embryo are called diploblastic animals and those having three germ layers are called triploblasticanimals.

Two types of animals have been recognised on the basis of origin of mouths: Protostomia (mouth arising from or near the blastopore of gastrula; gastrula is an embryonic stage) and Deuterostomia (mouth arising anteriorly at some distance from the blastopore).

Click Here To Download

  1. Reply
    digimonlinks hack apk November 23, 2017 at 10:57 pm

    They can also add chips to the Digimon.

  2. Reply
    game hacks November 29, 2017 at 6:39 am

    Are you a fan of card video games and cartoons?

  3. Reply
    mobile game cheats November 29, 2017 at 1:38 pm

    I put it in iltra low and it still body drops.

  4. Reply
    game hacks December 2, 2017 at 2:04 pm

    Save it for the 250 spirit orb summoning.

  5. Reply
    mobile game cheats December 4, 2017 at 8:47 am

    KLab Inc. Try preventing in weekly tournaments.

  6. Reply
    mobile gaming blog December 4, 2017 at 2:31 pm

    There are modes in Survivor Royale, Solo, and Co-op.

  7. Reply
    game hacks December 4, 2017 at 3:25 pm

    This can give a maximum of 25 factors per match.

  8. Reply
    gaming tips and tricks blog December 16, 2017 at 5:07 pm

    You may Get Card Just in 1-Click.

Leave a reply