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  • PYQs (GS & Optional)
  • (g) Annelida: Coelom and metamerism; modes of life in polychaetes; general features and life history of Nereis, earthworm and leach.

    • Annelida: Coelom and Metamerism
      • Discuss the concept of metamerism in annelids with relevant examples.
      • Concept and organization of Coelom.
      • Describe the perivisceral coelom and endoskeleton of Asterias.
      • What is coelom? Describe different types of coelom with the help of suitable diagram. Draw a linear diagram to show the evolutionary relationship among different phyla based on their coelom.
      • Describe the structure and phylogenetic significance of Trochophore larva.
      • Trochophore larva and its evolutionary significance.
      • Describe the external features of Nereis. What is Heteronereis and how does it differ from Nereis? Comment upon Metamerism in Annelida.
      • Describe locomotion in Hirudinaria.
      • What is metamerism? Describe its importance in invertebrates.
      • Describe the salient features of phylum Annelida. Classify the phylum up to orders giving their characteristics and suitable examples.
    • Modes of life in Polychaetes
      • Polychaetes exhibit different modes of life adapted to different habitats. Elaborate.
      • Polychaetes exhibit different modes of life adapted to habitats. Elaborate the statement.
      • Polychaetes exhibit different modes of life adapted to habitats. Elaborate the statement.
    • General Features and Life History of Nereis
      • With the help of suitable diagrams, describe the different stages of life cycle of Nereis.
      • Describe the life cycle of Nereis.
      • Describe the external features of Nereis. What is Heteronereis and how does it differ from Nereis? Comment upon Metamerism in Annelida.
      • Describe the general features of Nereis.
    • General Features and Life History of Earthworm
      • Describe the life cycle of earthworms.
      • Describe the general features of earthworms.
    • General Features and Life History of Leach
      • Describe the different stages of life cycle of leech with the help of suitable diagram.
      • Describe the general features of leech.
  1. PYQs and Practice Questions
  2. UPSC Optionals
  3. Zoology Optional
  4. Non-chordata and Chordata
  5. (g) Annelida: Coelom and metamerism; modes of life in polychaetes; general features and life history of Nereis, earthworm and leach.
  6. Annelida: Coelom and Metamerism

Discuss the concept of metamerism in annelids with relevant examples. (UPSC 2024, 15 Marks, )

  1. Posted by: Synopsis IAS
  2. Posted on:31 July 2025
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एनिलिड्स में मेटामेरिज्म की अवधारणा पर प्रासंगिक उदाहरणों के साथ चर्चा करें। (Discuss the concept of metamerism in annelids with relevant examples.)
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