Cyclorhagida MCQs January 8, 2026September 30, 2024 by u930973931_answers 30 min Score: 0 Attempted: 0/30 Subscribe 1. Cyclorhagida belongs to which phylum? (A) Kinorhyncha (B) Arthropoda (C) Nematoda (D) Annelida 2. What is the primary habitat of Cyclorhagida? (A) Freshwater (B) Marine sediments (C) Terrestrial soils (D) Airborne 3. What type of body segmentation is found in Cyclorhagida? (A) Unsegmented (B) 5 segments (C) 11 segments (D) 20 segments 4. Which of the following is a characteristic feature of Cyclorhagida? (A) Tentacles (B) Cilia (C) Spiny cuticle (D) Jointed legs 5. Cyclorhagida are primarily found in what kind of environment? (A) Rocky intertidal zones (B) Deep sea (C) Coastal mud (D) Desert sands 6. What is the main feeding habit of Cyclorhagida? (A) Herbivorous (B) Carnivorous (C) Detritivorous (D) Parasitic 7. How do Cyclorhagida move? (A) Ciliary movement (B) Jet propulsion (C) Crawling with retractable head (D) Flagellar swimming 8. What kind of exoskeleton do Cyclorhagida organisms have? (A) Collagenous (B) Chitinous (C) Calcium carbonate (D) Siliceous 9. What sensory structures are present in Cyclorhagida? (A) Eyes (B) Scalids (C) Antennae (D) Statocysts 10. Which structure in Cyclorhagida helps in locomotion and environmental sensing? (A) Tentacles (B) Scalids (C) Proboscis (D) Fins 11. Cyclorhagida are members of which order? (A) Allomalorhagida (B) Chaetognatha (C) Scalida (D) Cyclorhagida 12. How do Cyclorhagida burrow into marine sediments? (A) By using their tail (B) By digging with fins (C) Through retractable head spines (D) By pushing with their body segments 13. What type of reproduction is common in Cyclorhagida? (A) Asexual reproduction (B) Budding (C) Fragmentation (D) Sexual reproduction 14. Which of the following is absent in Cyclorhagida? (A) Nervous system (B) Digestive system (C) Circulatory system (D) Excretory system 15. How do Cyclorhagida obtain oxygen? (A) Through gills (B) Diffusion through the body wall (C) Through trachea (D) Via lungs 16. Which layer of cells forms the outer covering of Cyclorhagida? (A) Endoderm (B) Mesoderm (C) Exoskeleton (D) Ectoderm 17. Cyclorhagida lack which of the following systems? (A) Excretory system (B) Digestive system (C) Respiratory system (D) Nervous system 18. What is the mode of excretion in Cyclorhagida? (A) Diffusion through body wall (B) Malpighian tubules (C) Nephridia (D) Kidneys 19. Cyclorhagida are primarily: (A) Primary consumers (B) Decomposers (C) Secondary consumers (D) Producers 20. What structure allows Cyclorhagida to retract their head? (A) Scalids (B) Pharynx (C) Proboscis (D) Collar 21. Which system in Cyclorhagida is responsible for sensing its surroundings? (A) Digestive system (B) Muscular system (C) Respiratory system (D) Nervous system 22. Cyclorhagida species are typically found at which depth of the ocean? (A) Coral reefs (B) Deep-sea trenches (C) Surface waters (D) Shallow coastal waters 23. How many body rings do Cyclorhagida organisms typically have? (A) 5 (B) 10 (C) 11 (D) 15 24. Which part of the Cyclorhagida anatomy helps in anchoring the organism to the sediment? (A) Head with spines (B) Proboscis (C) Tail spines (D) Tentacles 25. Cyclorhagida are known for having what kind of digestive system? (A) No digestive system (B) Incomplete digestive system (C) Absorption only (D) Complete digestive system 26. Which structure in Cyclorhagida plays a role in environmental detection? (A) Tentacles (B) Cilia (C) Sensory scalids (D) Eyespots 27. Cyclorhagida organisms contribute to the ecosystem as: (A) Pollinators (B) Parasites (C) Detritivores (D) Photosynthesizers 28. What distinguishes Cyclorhagida from other Kinorhyncha groups? (A) Scalids surrounding the mouth (B) Lack of segmentation (C) Presence of antennae (D) Body made of chitin 29. Cyclorhagida play a critical role in the breakdown of which material? (A) Detritus and organic matter (B) Wood (C) Marine plants (D) Coral skeletons 30. Cyclorhagida species exhibit which type of development? (A) Direct development (B) Indirect development with larvae (C) Asexual reproduction (D) Regeneration of body parts