Question:
Nidamental gland helps in
Nidamental gland helps in
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The shell gland/nidamental gland is highly developed in oviparous sharks but remains small and rudimentary in viviparous (live-bearing) species.
Updated On: Aug 20, 2026
- Secretion of seminal fluid
- Secretion of egg case
- Smoltification
- Secretion of digestive enzymes
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Elasmobranchs (sharks and rays) and cephalopods have unique specialized anatomical structures within their reproductive tracts to protect their developing embryos.
Step 2: Detailed Explanation:
The nidamental gland (or shell gland) is a specialized secretory organ located in the oviduct of female elasmobranchs and cephalopods.
In oviparous species, it secretes a tough, protective proteinaceous egg case (sometimes called "mermaid's purse" in sharks) that encloses and shields the fertilized eggs during development.
Step 3: Final Answer:
Thus, the nidamental gland helps in the secretion of the egg case, which corresponds to option (B).
Elasmobranchs (sharks and rays) and cephalopods have unique specialized anatomical structures within their reproductive tracts to protect their developing embryos.
Step 2: Detailed Explanation:
The nidamental gland (or shell gland) is a specialized secretory organ located in the oviduct of female elasmobranchs and cephalopods.
In oviparous species, it secretes a tough, protective proteinaceous egg case (sometimes called "mermaid's purse" in sharks) that encloses and shields the fertilized eggs during development.
Step 3: Final Answer:
Thus, the nidamental gland helps in the secretion of the egg case, which corresponds to option (B).
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