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  • PYQs (GS & Optional)
  • (h) Arthropoda: Larval forms and parasitism in Crustacea; vision and respiration in arthropods (Prawn, cockroach and scorpion); modification of mouth parts in insects (cockroach, mosquito, housefly, honey bee and butterfly); metamorphosis in insect and its hormonal regulation, social behaviour of Apis and termites

    • Describe the salient features of phylum Arthropoda. Classify the phylum up to classes giving their characteristics and suitable examples.
    • Larval Forms and Parasitism in Crustacea
      • Describe the different larval forms of Crustaceans with suitable diagrams.
      • Describe the larval forms of Crustacea with suitable diagrams.
      • Give an account of larval forms in Crustacea with examples and diagrams. Also write a note on the significance of larvae.
      • Parasitism in Crustacea.
      • Give a detailed account of various larval forms of crustaceans and discuss their significance.
      • Give an account of the larval forms of Crustaceans. Add a note on their taxonomic significance.
    • Sub-Topic: Copepoda
      • Discuss parasitism in Copepoda. Comment on structural peculiarities of parasitic copepods.
      • Discuss parasitism in Copepoda. Comment on structural peculiarities of parasitic copepods.
      • Describe the great departures shown by parasitic forms from the diagnostic features of free-living forms among Copepoda.
    • Vision and Respiration in Arthropods (Prawn, Cockroach, and Scorpion)
      • Describe the structure and role of book-lungs in scorpions.
      • Vision in arthropods.
      • Describe the respiratory organs and mechanism of respiration in cockroach.
      • Structure of visual organs of cockroach.
      • Explain the structure of respiratory organs and write the mechanism of terrestrial and aquatic respiration in arthropods.
      • Vision and respiration in prawn.
      • Vision and respiration in cockroach.
      • Vision and respiration in scorpion.
    • Modification of Mouthparts in Insects (Cockroach, Mosquito, Housefly, Honey Bee, and Butterfly)
      • Write an account on modification of mouthparts in Insecta. Give suitable examples and diagrams.
      • With the help of labelled diagrams, describe the mouth parts of housefly, butterfly, and honeybee.
      • Give an illustrated account of different types of mouth parts in insects and write a note on their functional significance.
      • Describe the biting and chewing, siphoning, and piercing and sucking mouth parts in insects with suitable examples.
      • Differentiate the structural variation of mouthparts in Insecta diagrammatically and label them.
      • Differentiate the structural variation of mouthparts in Insecta diagrammatically and label them.
      • Draw a labelled diagram of the alimentary canal and salivary apparatus in Periplaneta americana.
      • Give the salient features of Apterygota and Pterygota.
      • Write a detailed account of modification of mouthparts in insects and support your answer with well-labelled diagrams.
      • Blood feeding and phytophagous insects. (200 Words)
    • Metamorphosis in Insects and its Hormonal Regulation
      • Metamorphosis in Insects.
      • Define metamorphosis. Explain the hormonal control of metamorphosis in insects.
      • Describe the hormonal regulation of metamorphosis in amphibians.
      • What is metamorphosis? Describe the hormonal regulation of metamorphosis in insects.
      • Give a brief account of hormonal regulation of metamorphosis in insects.
      • "Glycolysis is considered as metabolic hub." Justify. What is metamorphosis? Explain the role of thyroxine in the regulation of amphibian metamorphosis.
      • Explain the neuro-endocrine regulation of insect metamorphosis with suitable illustrations. Comment on the role of JH (Juvenile Hormone) in insect metamorphosis.
      • Explain the types of metamorphosis in insects and their hormonal regulation.
      • What is metamorphosis? Differentiate between retrogressive and progressive metamorphosis, with figures and examples. How are they regulated?
      • Suitable illustrations delineate the role of triiodothyronine and tetraiodothyronine in amphibian metamorphosis.
      • Discuss the interactive role of thyroxine and prolactin during various phases of growth and differentiation in amphibian metamorphosis. (Repeated in both entriesmerged here.)
      • Give an illustrated account of interaction of neuroendocrine secretions in promoting metamorphosis in an orthopteran and a lepidopteran insect. Mention the type of metamorphosis that these insects undergo.
      • Explain the metamorphosis in insects and its hormonal regulation.
      • Metamorphosis in insects.
      • Hormonal regulation of metamorphosis in insects. (200 words)
      • Causes of metamorphosis in insects.
      • Retrogressive metamorphosis.
    • Social Behaviour of Apis (Honey Bee) and Termites
      • Social behaviour in honeybees
      • Write an account on the Social Behavior in Apis and Termites.
      • Give an account of Social behavior in Termites.
      • Give an account of Social behavior in Termites.
      • Apis is known for social behaviour. Discuss.
      • Apis is known for social behaviour. Discuss.
      • Compare the social organization of termites and honeybees.
      • Give a brief account of social organisations and determination of 'castes' in termites.
      • Social behaviour of Apis 200 Words
      • Discuss the social life of honeybees and termites.
  1. PYQs and Practice Questions
  2. UPSC Optionals
  3. Zoology Optional
  4. Non-chordata and Chordata
  5. (h) Arthropoda: Larval forms and parasitism in Crustacea; vision and respiration in arthropods (Prawn, cockroach and scorpion); modification of mouth parts in insects (cockroach, mosquito, housefly, honey bee and butterfly); metamorphosis in insect and its hormonal regulation, social behaviour of Apis and termites
  6. Modification of Mouthparts in Insects (Cockroach, Mosquito, Housefly, Honey Bee, and Butterfly)

Describe the biting and chewing, siphoning, and piercing and sucking mouth parts in insects with suitable examples. (UPSC 2017, 15 Marks, )

  1. Posted by: Synopsis IAS
  2. Posted on:31 July 2025
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कीटों में काटने और चबाने, चूसने और छेदने वाले मुखांगों का उपयुक्त उदाहरणों के साथ वर्णन करें। (Describe the biting and chewing, siphoning, and piercing and sucking mouth parts in insects with suitable examples.)
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