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How to Identify and Classify Snails
Contributed by: Wallis
  • 1. What is the primary characteristic used to initially classify a snail?
A) Antennae length
B) Diet
C) Shell presence and type
D) Foot color
  • 2. A snail with a single, spiraled shell is likely a...
A) Cephalopod
B) Polychaete
C) Bivalve
D) Gastropod
  • 3. What does 'dextral' refer to in snail shells?
A) A left-handed spiral
B) The shell's texture
C) A right-handed spiral
D) A shell with no spiral
  • 4. The opening of a snail shell is called the...
A) Whorl
B) Apex
C) Suture
D) Aperture
  • 5. What is the operculum?
A) A layer of shell growth
B) A 'door' that closes the aperture
C) A sensory organ
D) The snail's mouth
  • 6. Snail shells are primarily composed of...
A) Silica
B) Chitin
C) Calcium carbonate
D) Protein
  • 7. The pointed top of the shell is called the...
A) Apex
B) Base
C) Lip
D) Columella
  • 8. What is a keel on a snail shell?
A) A sharp ridge
B) A growth line
C) A smooth surface
D) A deep groove
  • 9. What type of environment do terrestrial snails inhabit?
A) Saltwater
B) Land
C) Freshwater
D) Brackish water
  • 10. What is a key difference between marine and freshwater snails?
A) Diet
B) Shell shape
C) Salinity tolerance
D) Size
  • 11. How do you identify a snail at the family level?
A) Only shell color
B) By its location
C) Only size
D) Analyzing shell and soft body features
  • 12. What are the spiral lines on a snail shell's surface called?
A) Spiral cords
B) Axial ribs
C) Varices
D) Growth rings
  • 13. What is the umbilicus of a snail shell?
A) A hole at the shell's base
B) The shell's outer lip
C) The shell's inner layer
D) The shell's texture
  • 14. What feature is important when classifying snails based on their habitat?
A) Foot size
B) Shell size
C) Shell color
D) Adaptations to water availability
  • 15. How is the size of a snail shell typically measured?
A) By weight
B) Only length
C) Length and width
D) Only width
  • 16. What does 'sinistral' refer to in snail shells?
A) A left-handed spiral
B) A right-handed spiral
C) The shell's color
D) A shell with no spiral
  • 17. The whorls of the snail shell are separated by...
A) Aperture
B) Sutures
C) Apex
D) Columella
  • 18. What is the columella of a snail shell?
A) The outer lip
B) The central axis
C) A sensory organ
D) The apex
  • 19. What is a varix on a snail shell?
A) A raised, thickened growth line
B) A sharp spine
C) A spiral groove
D) A smooth area
  • 20. What is a common food source for terrestrial snails?
A) Small fish
B) Insects
C) Vegetation
D) Algae
  • 21. Which snail is most likely to be found in a deep ocean trench?
A) A tree snail
B) A deep-sea snail
C) A pond snail
D) A garden snail
  • 22. What is the function of the snail's foot?
A) Digestion
B) Locomotion
C) Shell creation
D) Respiration
  • 23. Why is shell ornamentation important for snail identification?
A) It indicates age
B) It affects taste
C) Distinct patterns can define species
D) It determines size
  • 24. Which feature helps snails adhere to surfaces?
A) Suction cups
B) Strong muscles
C) Mucus secretion
D) Sharp claws
  • 25. What is the mantle of a snail?
A) The muscular foot
B) The snail's brain
C) The respiratory organ
D) Tissue that secretes the shell
  • 26. What is the radula of a snail?
A) A rasping tongue-like organ
B) A reproductive organ
C) An internal gill
D) A sensory tentacle
  • 27. What type of diet is common for marine snails?
A) Exclusively herbivorous
B) Only detritivorous
C) Herbivorous, carnivorous, or detritivorous
D) Exclusively carnivorous
  • 28. What feature distinguishes a pulmonate snail?
A) A very long foot
B) A lung-like cavity for breathing
C) Absence of a shell
D) External gills
  • 29. What role do snails play in the ecosystem?
A) Pollinators
B) Producers of oxygen
C) Top predators
D) Decomposers and food source
  • 30. How does pollution affect snail populations?
A) Attracts them to contaminated areas
B) Enhanced resistance to disease
C) Shell damage and reduced reproduction
D) Increased shell growth
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