Siphunculida MCQs January 8, 2026September 30, 2024 by u930973931_answers 30 min Score: 0 Attempted: 0/30 Subscribe 1. What type of organism are Siphunculida commonly known as? (A) Earthworms (B) Snails (C) Sea cucumbers (D) Peanut worms 2. What is the primary habitat of Siphunculida? (A) Freshwater (B) Marine (C) Terrestrial (D) Brackish water 3. Which class do Siphunculida belong to? (A) Annelida (B) Arthropoda (C) Mollusca (D) Sipuncula 4. Siphunculida are primarily characterized by what type of body structure? (A) Segmented (B) Unsegmented (C) Radially symmetrical (D) Pseudocoelomate 5. What is the main method of locomotion for Siphunculida? (A) Floating (B) Swimming (C) Crawling on surfaces (D) Burrowing 6. Which structure do Siphunculida use for feeding? (A) Tentacles (B) Proboscis (C) Gills (D) Jaws 7. How do Siphunculida typically reproduce? (A) Sexually with external fertilization (B) Asexually through budding (C) Asexually through fission (D) Parthenogenetically 8. What is the body cavity of Siphunculida called? (A) Coelom (B) Hemocoel (C) Gastrovascular cavity (D) Pseudocoelom 9. Which of the following is a characteristic of Siphunculida? (A) They lack a nervous system. (B) They possess a hard shell. (C) They have well-developed eyes. (D) They can retract their bodies into their shells. 10. What type of symmetry do Siphunculida exhibit? (A) Bilateral symmetry (B) Radial symmetry (C) Asymmetry (D) Pentaradial symmetry 11. What is the primary feeding strategy of Siphunculida? (A) Deposit feeding (B) Filter feeding (C) Predatory feeding (D) Herbivorous feeding 12. Which of the following structures is primarily involved in respiration for Siphunculida? (A) Gills (B) Body surface (C) Lungs (D) Specialized breathing structures 13. Which of the following is NOT a characteristic of Siphunculida? (A) Presence of a hard exoskeleton (B) Lack of segmentation (C) Soft-bodied (D) Presence of a coelom 14. Siphunculida are known for their ability to do what? (A) Swim freely (B) Fly short distances (C) Form colonies (D) Burrow into the substrate 15. What is the typical length range of Siphunculida species? (A) 5-30 cm (B) 1-5 cm (C) 30-60 cm (D) 60-100 cm 16. What type of digestive system do Siphunculida possess? (A) Complete digestive system (B) Incomplete digestive system (C) Simple sac-like (D) No digestive system 17. Which of the following statements about Siphunculida is true? (A) They have a complex circulatory system. (B) They have a simple nervous system. (C) They are exclusively freshwater organisms. (D) They exhibit complex reproductive strategies. 18. What kind of excretory system do Siphunculida have? (A) Malpighian tubules (B) Nephridia (C) Coelomoducts (D) Protonephridia 19. Which of the following features helps Siphunculida in nutrient recycling? (A) They feed on organic matter. (B) They are top predators. (C) They are major primary producers. (D) They serve no significant ecological role. 20. What is the primary ecological role of Siphunculida? (A) Primary producers (B) Predators (C) Decomposers (D) Herbivores 21. Which structure is involved in the reproductive process of Siphunculida? (A) Gonads (B) Gills (C) Tentacles (D) Body wall 22. What type of development do Siphunculida exhibit? (A) Indirect development with larval stages (B) Direct development (C) Asexual development (D) Parthenogenetic development 23. Which of the following statements about Siphunculida is correct? (A) They possess a rigid exoskeleton. (B) They lack a proboscis. (C) They are primarily found in freshwater habitats. (D) They have a hydrostatic skeleton. 24. What is a defining characteristic of the Siphunculida? (A) Presence of antennae (B) Complex circulatory system (C) Lack of segmentation (D) Highly developed eyes 25. Siphunculida primarily feed on which of the following? (A) Algae (B) Detritus and organic matter (C) Other animals (D) Plant matter 26. Which of the following is a common feature of Siphunculida? (A) Presence of a shell (B) Soft-bodied (C) Complex social behavior (D) Photosynthetic capabilities 27. What type of circulatory system do Siphunculida possess? (A) Open circulatory system (B) Closed circulatory system (C) No circulatory system (D) Simple diffusion 28. What is the function of the introvert in Siphunculida? (A) Locomotion (B) Feeding (C) Respiration (D) Reproduction 29. Which of the following structures helps Siphunculida in movement? (A) Legs (B) Fins (C) Cilia (D) Muscular body contractions 30. Which of the following is a common predator of Siphunculida? (A) Small fish (B) Crabs (C) Larger invertebrates (D) Birds