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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. Torsion and Detorsion in gastropods

Torsion in Gastropoda (UPSC 2021, 8 Marks, )

गैस्ट्रोपोडा में मरोड़ (Torsion in Gastropoda)
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Introduction
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What do you understand about Torsion and Detorsion in Mollusca? Elucidate. (UPSC 2019, 15 Marks, )

आप मोलस्का में टॉर्शन और डिटॉर्शन के बारे में क्या समझते हैं? स्पष्ट करें। (What do you understand about Torsion and Detorsion in Mollusca? Elucidate.)
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Introduction
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What is Torsion? Describe the significance of torsion and detorsion in Gastropods. (UPSC 2017, 10 Marks, )

टॉर्शन क्या है? गैस्ट्रोपोड्स में टॉर्शन और डिटॉर्शन के महत्व का वर्णन करें। (What is Torsion? Describe the significance of torsion and detorsion in Gastropods.)
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Introduction
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Explain phenomenon of Torsion and detorsion in gastropods and also write their significance. (UPSC 2016, 10 Marks, )

गैस्ट्रोपोड्स में मरोड़ और विमरोड़ की घटना को समझाएं और उनके महत्व को भी लिखें। (Explain phenomenon of Torsion and detorsion in gastropods and also write their significance.)
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Introduction
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Explain phenomenon of Torsion and detorsion in gastropods and also write their significance. (UPSC 2016, 10 Marks, )

गैस्ट्रोपोड्स में मरोड़ और विमरोड़ की घटना को समझाएं और उनके महत्व को भी लिखें। (Explain phenomenon of Torsion and detorsion in gastropods and also write their significance.)
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Introduction
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Describe “Torsion and Detorsion” in Gastropoda. Add a note on the significance of this phenomenon. (UPSC 2014, 15 Marks, )

गैस्ट्रोपोडा में <b><i>"मरोड़ और विमरोड़"</i></b> का वर्णन करें। इस घटना के महत्व पर एक टिप्पणी जोड़ें। (Describe <b><i>"Torsion and Detorsion"</i></b> in Gastropoda. Add a note on the significance of this phenomenon.)
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Introduction
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Describe “Torsion and Detorsion” in Gastropoda. Add a note on the significance of this phenomenon. (UPSC 2014, 15 Marks, )

गैस्ट्रोपोडा में <b><i>"मरोड़ और विमरोड़"</i></b> का वर्णन करें। इस घटना के महत्व पर एक टिप्पणी जोड़ें। (Describe <b><i>"Torsion and Detorsion"</i></b> in Gastropoda. Add a note on the significance of this phenomenon.)
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Introduction
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What is torsion? How does it occur in certain gastropods? Give an illustrated account of torsion and detorsion in this molluscan class. (UPSC 2012, 20 Marks, )

टॉर्शन क्या है? यह कुछ गैस्ट्रोपोड्स में कैसे होता है? इस मोलस्कन वर्ग में टॉर्शन और डिटॉर्शन का चित्रित विवरण दें। (What is torsion? How does it occur in certain gastropods? Give an illustrated account of torsion and detorsion in this molluscan class.)
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Introduction
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Describe torsion and detorsion in Mollusca. (UPSC 2009, 30 Marks, )

मोलस्का में वक्रण और अपवक्रण का वर्णन करें। (Describe torsion and detorsion in Mollusca.)
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Introduction
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Torsion in gastropods. (UPSC 2007, 20 Marks, )

गैस्ट्रोपोड्स में मरोड़। (Torsion in gastropods.)
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Introduction
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