1.

Write the general characters of the phylum arthropoda.

Answer»

These are bilaterally symmetrical, triploblastic, schizocoelomate, segmented animals.

  • They have organ system grade of organisation.
  • They have jointed appendages
  • Body is covered by chitinous exoskeleton. Body is divided into head, thorax and abdomen.
  • Body cavity is filled with colourless blood. It is called haemocoel.
  • Respiratory organs are gills, book gills, book lungs, trachea.
  • Open type circulation is seen.
  •  Sense organs are present.
  • Fertilization is internal, e.g., Limulus and insects.


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