1.

Write the general characters of the phylum mollusca.

Answer»
  • Molluscs are terrestrial or aquatic with organ system level of organisation.
  • They are triploblastic, bilaterally symmetrical, coelomate animals.
  • Body is divided into head, foot and visceral hump.
  • The digestive system is complete
  • Nephridia are the excretory organs.
  • Open type of circulatory system is seen.
  • Blood contains copper containing respiratory pigment called hemocyanin.
  • They are oviparous. 
  • Development is indirect with a veliger larva, e.g., Pila and Octopus.


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