Question:
Radula, in molluscs, is supported by
Radula, in molluscs, is supported by
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The Radular apparatus is composed of:
1. Radular ribbon (chitinous teeth).
2. Odontophore (cartilaginous support block).
1. Radular ribbon (chitinous teeth).
2. Odontophore (cartilaginous support block).
Updated On: Jul 24, 2026
- Hingle ligament
- Odontophore
- Operculum
- Umbone
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
The mouthparts of molluscs (excluding bivalves) contain a unique, specialized feeding apparatus designed for scraping, tearing, or cutting food before it enters the esophagus.
Step 2: Detailed Explanation:
Let us analyze the anatomical structures associated with molluscs:
The hinge ligament and umbone are structures found in bivalve shells (like clams and mussels), used for shell closure and representing the oldest part of the shell, respectively.
The operculum is a calcareous or horny plate present in gastropods used to close the shell aperture when the animal retracts.
The radula is a tough, chitinous ribbon covered with rows of microscopic, sharp teeth.
This radular ribbon is situated in the buccal cavity of gastropods and cephalopods.
During feeding, the radula is projected out of the mouth to scrape algae or food off rocks.
To function, this flexible, saw-like ribbon must be supported and moved by a firm underlying structure.
This supporting structure is a movable, cartilaginous bolster known as the odontophore.
Muscle groups attached to the odontophore and radula control its projection and retraction.
Therefore, the radula is supported by the odontophore.
Step 3: Final Answer:
In molluscs, the radula is supported by the Odontophore.
The mouthparts of molluscs (excluding bivalves) contain a unique, specialized feeding apparatus designed for scraping, tearing, or cutting food before it enters the esophagus.
Step 2: Detailed Explanation:
Let us analyze the anatomical structures associated with molluscs:
The hinge ligament and umbone are structures found in bivalve shells (like clams and mussels), used for shell closure and representing the oldest part of the shell, respectively.
The operculum is a calcareous or horny plate present in gastropods used to close the shell aperture when the animal retracts.
The radula is a tough, chitinous ribbon covered with rows of microscopic, sharp teeth.
This radular ribbon is situated in the buccal cavity of gastropods and cephalopods.
During feeding, the radula is projected out of the mouth to scrape algae or food off rocks.
To function, this flexible, saw-like ribbon must be supported and moved by a firm underlying structure.
This supporting structure is a movable, cartilaginous bolster known as the odontophore.
Muscle groups attached to the odontophore and radula control its projection and retraction.
Therefore, the radula is supported by the odontophore.
Step 3: Final Answer:
In molluscs, the radula is supported by the Odontophore.
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