Phylum Annelida


 
 
Concept Explanation
 

Phylum Annelida

Annelids are segmented worms. Their characteristics are :

  • The segments are visible externally as rings and separated internally by septa.
  • Many annelids have bristle-like appendages protruding from each segment.
  • These are chitinous (nitrogenous polysaccharide which is strong and light) projections, called chaetae (setae) that help in locomotion.
  • Some annelids, like leeches, do not have chaetae. In the course of evolution, annelids were the first animals to have a true body cavity, or coelom. The alimentary canal has special regions.
  • The circulatory system is of the closed type and the excretory system consists of coiled tubes called nephridia.
  • Reproduction in annelids takes place sexually. The sexes may be separate (e.g., Nereis) or the animal (like earthworms) may be a hermaphrodite.
  • Annelids live in moist soil, freshwater and the sea. Earthworms (Pheretima), leeches( Hirudinaria), clamworms (Nereis) and sea mouse (Aphrodite) are all annelids. Leeches are ectoparasites. They attach themselves to animals and feed by suckers.
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    Sample Questions
    (More Questions for each concept available in Login)
    Question : 1

    The excretory organs of Annelida are ________________

    Right Option : A
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    Question : 2

    Name the phylum which includes organisms having -

    (i) coelom ,

    (ii) Body elongated, vermiform and cylindrical,

    (iii) Body is divided into segments by ring - like grooves

    Right Option : D
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    Explanation
    Question : 3

    Naphridia of Earthworm are performing same function as _______________________

    Right Option : B
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    Explanation
     
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