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  • PYQs (GS & Optional)
  • (i) Mollusca: Feeding, respiration, locomotion, general features and life history of Lamellidens, Pila and Sepia, torsion and detorsion in gastropods.

    • Mollusca
      • Classify phylum Mollusca up to class level and mention characteristic features of each class with relevant examples.
      • Shell diversity in Mollusca
      • Elucidate the structural diversity of shells in molluscs. Also, write their functions.
    • Feeding mechanisms of Mollusca
    • Discuss respiration in Mollusca indicating suitable examples.
    • Locomotion in Mollusca
    • Explain the structure and functions of respiratory organ of Lamellidens branchiata.
    • Describe the respiratory organs and mechanism of respiration in Pila.
    • Describe the respiratory organs and mechanism of respiration in Sepia.
    • Torsion and Detorsion in gastropods
      • Torsion in Gastropoda
      • What do you understand about Torsion and Detorsion in Mollusca? Elucidate.
      • What is Torsion? Describe the significance of torsion and detorsion in Gastropods.
      • Explain phenomenon of Torsion and detorsion in gastropods and also write their significance.
      • Explain phenomenon of Torsion and detorsion in gastropods and also write their significance.
      • Describe “Torsion and Detorsion” in Gastropoda. Add a note on the significance of this phenomenon.
      • Describe “Torsion and Detorsion” in Gastropoda. Add a note on the significance of this phenomenon.
      • What is torsion? How does it occur in certain gastropods? Give an illustrated account of torsion and detorsion in this molluscan class.
      • Describe torsion and detorsion in Mollusca.
      • Torsion in gastropods.
  1. PYQs and Practice Questions
  2. UPSC Optionals
  3. Zoology Optional
  4. Non-chordata and Chordata
  5. (i) Mollusca: Feeding, respiration, locomotion, general features and life history of Lamellidens, Pila and Sepia, torsion and detorsion in gastropods.
  6. General features and life history of Lamellidens

Explain the structure and functions of respiratory organ of Lamellidens branchiata. (UPSC 2010, 30 Marks, )

लैमलिडेन्स ब्रांकिएटा के श्वसन अंग की संरचना और कार्यों की व्याख्या करें। (Explain the structure and functions of respiratory organ of Lamellidens branchiata.)
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