Sipunculidea MCQs December 3, 2025September 30, 2024 by u930973931_answers 30 min Score: 0 Attempted: 0/30 Subscribe 1. What is the primary habitat of Sipunculidea? (A) Freshwater (B) Terrestrial (C) Marine (D) Brackish water 2. Which of the following best describes the body structure of Sipunculidea? (A) Unsegmented (B) Segmented (C) Radially symmetrical (D) Pseudocoelomate 3. What is the primary mode of locomotion in Sipunculidea? (A) Crawling using legs (B) Floating in water (C) Swimming using fins (D) Burrowing 4. Sipunculidea are primarily classified as which type of organism? (A) Mollusks (B) Annelids (C) Cnidarians (D) Arthropods 5. What is the primary feeding strategy of Sipunculidea? (A) Deposit feeding (B) Filter feeding (C) Predatory feeding (D) Herbivorous feeding 6. Which structure do Sipunculidea use for feeding? (A) Tentacles (B) Jaws (C) Proboscis (D) Gills 7. How do Sipunculidea typically reproduce? (A) Asexually through budding (B) Parthenogenetically (C) Asexually through fission (D) Sexually with external fertilization 8. What is the main body cavity of Sipunculidea called? (A) Coelom (B) Hemocoel (C) Gastrovascular cavity (D) Pseudocoelom 9. Which of the following is a characteristic of Sipunculidea? (A) They have well-developed eyes. (B) They possess a hard shell. (C) They can retract their bodies into their shells. (D) They lack a nervous system. 10. What is the function of the introvert in Sipunculidea? (A) Locomotion (B) Feeding (C) Respiration (D) Reproduction 11. Which of the following classes does Sipunculidea belong to? (A) Sipuncula (B) Polychaeta (C) Oligochaeta (D) Hirudinea 12. What is the typical length range of Sipunculidea species? (A) 1-5 cm (B) 5-30 cm (C) 30-60 cm (D) 60-100 cm 13. What type of symmetry do Sipunculidea exhibit? (A) Radial symmetry (B) Asymmetry (C) Bilateral symmetry (D) Pentaradial symmetry 14. Sipunculidea are often found in which of the following environments? (A) High-altitude lakes (B) Coral reefs (C) Sandy or muddy substrates in the ocean (D) Freshwater rivers 15. Which of the following is NOT a characteristic of Sipunculidea? (A) Presence of a hard exoskeleton (B) Lack of segmentation (C) Soft-bodied (D) Presence of a coelom 16. Which of the following statements about Sipunculidea is true? (A) They have a simple nervous system. (B) They have a complex circulatory system. (C) They are exclusively freshwater organisms. (D) They exhibit complex reproductive strategies. 17. What is the primary ecological role of Sipunculidea? (A) Primary producers (B) Predators (C) Herbivores (D) Decomposers 18. Which of the following features helps Sipunculidea in respiration? (A) Body surface (B) Gills (C) Lungs (D) Specialized breathing structures 19. How do Sipunculidea contribute to their ecosystem? (A) By producing oxygen (B) By preying on larger organisms (C) By forming symbiotic relationships (D) By recycling nutrients 20. What is the function of the cuticle in Sipunculidea? (A) Locomotion (B) Protection (C) Respiration (D) Digestion 21. What type of digestive system do Sipunculidea possess? (A) Incomplete digestive system (B) Simple sac-like (C) Complete digestive system (D) No digestive system 22. Which of the following structures is primarily involved in locomotion for Sipunculidea? (A) Fins (B) Muscular body contractions (C) Cilia (D) Legs 23. What kind of excretory system do Sipunculidea have? (A) Malpighian tubules (B) Coelomoducts (C) Protonephridia (D) Nephridia 24. Sipunculidea exhibit a form of development known as what? (A) Direct development (B) Parthenogenetic development (C) Asexual development (D) Indirect development with larval stages 25. Which structure is involved in the reproductive process of Sipunculidea? (A) Tentacles (B) Gills (C) Gonads (D) Body wall 26. Sipunculidea are known for their ability to do what? (A) Burrow into the substrate (B) Swim freely (C) Form colonies (D) Fly short distances 27. What do Sipunculidea primarily feed on? (A) Larger animals (B) Detritus (C) Algae (D) Organic matter and microorganisms 28. What is the significance of Sipunculidea in marine ecosystems? (A) They serve no significant ecological role. (B) They are top predators. (C) They are major primary producers. (D) They help in sediment turnover. 29. Which of the following is a common feature of Sipunculidea? (A) Presence of a shell (B) Photosynthetic capabilities (C) Complex social behavior (D) Soft-bodied 30. What characteristic distinguishes Sipunculidea from other annelids? (A) Presence of setae (B) Lack of segmentation (C) Presence of a hard exoskeleton (D) Complex reproductive strategies