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Phylum Mollusca MCQ - Practice Questions with Answers

Edited By admin | Updated on Sep 18, 2023 18:34 AM | #NEET

Quick Facts

  • Phylum Mollusca and Body Plan of Mollusca is considered one of the most asked concept.

  • 11 Questions around this concept.

Solve by difficulty

In which one of the following the genus name, its two charcters and its phylum are not correctly matched, whereas the remaining three are correct

 

Genus name

  Two Characters

Phylum

 

Concepts Covered - 1

Phylum Mollusca and Body Plan of Mollusca
  • The term ‘Mollusca’ is obtained from the Latin word molluscus that means soft-bodied. The phylum contains soft-bodied animals
  • It is the second largest phylum of Kingdom Animalia with 60,000 species documented.
  • They are mostly marine. However, they are also found in freshwater and on land
  • They have organ system level of organization
  • They have a true coelom but the coelom is greatly reduced. They are triploblastic
  • They are bilaterally symmetrical
  • Examples: Pila (Apple snail), Pinctada (Pearl oyster), Sepia (Cuttlefish), Loligo (Squid), Octopus (Devil fish), Aplysia (Seahare), Dentalium (Tusk shell) and Chaetopleura (Chiton).

Body Plan of Mollusca:

  • Molluscs are unsegmented animals. 
  • The body may have a covering of hard calcareous shell. The body can be distinguished into three different parts as:
  • Head - sensory organs and mouth are present here
  • Muscular foot - used for locomotion
  • Visceral hump - dorsally placed and contains digestive system, excretory system and heart.
  • There is a soft and spongy layer of skin over the visceral hump called mantle. 
  • This mantle secretes calcium carbonate shell on its outer surface.
  • The space between the visceral hump and mantle is called mantle cavity. Gills are present in this cavity.These help in Respiration and Excretion 
  • The general body plan of molluscs can be shown as follows:

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Phylum Mollusca and Body Plan of Mollusca

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