Quiz  /  Mollusca Class 9 MCQ Questions With Answers

  • 1. 
    What is the radula used for?

  • Locomotion
  • Feeding
  • Swimming
  • Digging

  • 2. 
    Which TYPE of mollusk has ONE or NO shell?

  • Bivalve
  • Gastropod
  • Cephalopod

  • 3. 
    Which class of Mollusks is the only class with some terrestrial species?

  • Gastropods
  • Bivalves
  • Cephalopods

  • 4. 
    Which part of the Mollusk body is specialized for burrowing, feeding, and movement?

  • trochophores
  • visceral mass
  • mantle
  • foot

  • 5. 
    Which group of cephalopods has ability to flatten body to fit in small spaces and change skin to blend with surroundings?

  • Cuttlefish
  • Nautilus
  • Squid
  • Octopuses

  • 6. 
    All mollusks have an external shell.

  • True
  • False

  • 7. 
    The protective shell of a mollusk...

  • is secreted by the mantle.
  • Grows from the end of the mollusk foot.
  • Is constantly replaced by bigger shells as the mollusk grows.
  • forms when the mollusk reaches adulthood.

  • 8. 
    How do Bivalves obtain food?

  • Tentacles to catch food
  • Siphons to filter feed
  • Radula to scrap the sea floor

  • 9. 
    Name the class pictured

  • Aplacophora
  • Polyplacophora
  • Bivalvia
  • Monoplacophora

  • 10. 
    The scaly footed snail gets its "suit of armor" from:

  • symbiotic bacteria
  • dissolved metals from hydrothermal vents
  • its parents
  • special sand in the intertidal zones near India

  • 11. 
    Which class of Mollusks include squid, cuttlefish and octopus?

  • Gastropods
  • Bivalves
  • Cephalopods
  • Polyplacophora

  • 12. 
    The protective membrane that surrounds the visceral mass on all mollusks is called...

  • Radula
  • Mantle
  • Nephridia
  • Visceral Shield

  • 13. 
    Which TYPE of mollusk is most intelligent?

  • Bivalve
  • Gastropod
  • Cephalopod

  • 14. 
    What are trochophores?

  • A class of mollusks
  • A sessile larval form of a mollusk
  • A motile larval form of a mollusk
  • A type of worm

  • 15. 
    Which TYPE of mollusk has two shells?

  • Bivalve
  • Gastropod
  • Cephalopod

  • 16. 
    What TYPE of mollusk is this?

  • Bivalve
  • Gastropod
  • Cephalopod

  • 17. 
    Cephalopods have small brains compared to their body size.

  • true
  • false

  • 18. 
    What does Cephalopod mean?

  • means "2-shells"
  • means "head-foot"
  • means "stomach-foot"

  • 19. 
    Cephalopod blood contains copper, which gives the oxygenated blood a red color.

  • true
  • false

  • 20. 
    How many overlapping plates make up a chiton's shell?

  • 7
  • 10
  • 6
  • 8

  • 21. 
    Molluscs that live in a tusk like shell is open at both ends belong to the class:

  • Polyplacophora
  • Scaphopoda
  • Cephalopoda
  • Gastropoda

  • 22. 
    Cephalopods move by

  • using jet propulsion
  • waving their tentacles back and forth.
  • crawling along on a single muscular foot.
  • clapping their shells together.

  • 23. 
    Which class of Mollusks includes snails, slugs, or nudibranches?

  • Cephalapods
  • Bivalves
  • Gastropods

  • 24. 
    Which of the following is NOT a class of mollusk?

  • Gastropods
  • Bivalves
  • Cephalopods
  • Porifera

  • 25. 
    Which group has no shell?

  • Aplacophora
  • Monoplacophora
  • Gastropoda
  • Polyplacophora

  • 26. 
    Which class of Mollusks have a closed circulatory system?

  • Gastropods
  • Bivalves
  • Cephalopods
  • All of the classes
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