Phylum Kinorhyncha MCQs January 8, 2026September 28, 2024 by u930973931_answers 30 min Score: 0 Attempted: 0/30 Subscribe 1. Kinorhyncha are commonly known as: (A) Mud dragons (B) Thorny-headed worms (C) Spiny-headed worms (D) Tiny marine worms 2. What type of body symmetry do Kinorhyncha exhibit? (A) Radial symmetry (B) Bilateral symmetry (C) Asymmetry (D) Pentaradial symmetry 3. Kinorhyncha primarily inhabit which type of environment? (A) Terrestrial (B) Freshwater (C) Marine sediments (D) Brackish 4. How many segments are typically present in the body of Kinorhyncha? (A) 5 (B) 11 (C) 15 (D) 20 5. Kinorhyncha possess a structure called a: (A) Notochord (B) Siphon (C) Proboscis (D) Rostrum 6. What is the primary function of the cuticle in Kinorhyncha? (A) Locomotion (B) Respiration (C) Feeding (D) Protection 7. Kinorhyncha are classified as: (A) Acoelomates (B) Pseudocoelomates (C) Coelomates (D) None of the above 8. The primary mode of locomotion in Kinorhyncha is: (A) Burrowing (B) Crawling (C) Swimming (D) Floating 9. Which of the following statements about Kinorhyncha is true? (A) They have a complex nervous system (B) They are free-living and not parasitic (C) They possess a true circulatory system (D) They lack any body segmentation 10. What type of reproduction do Kinorhyncha primarily engage in? (A) Asexual reproduction (B) Sexual reproduction (C) Budding (D) Fragmentation 11. Which of the following best describes the digestive system of Kinorhyncha? (A) Complete with a mouth and anus (B) Incomplete with only a mouth (C) Absence of a digestive system (D) Simple with a gastrovascular cavity 12. The larval form of Kinorhyncha is known as: (A) Nauplius (B) Trochophore (C) Veliger (D) Kinorhynch larva 13. Kinorhyncha are characterized by: (A) A complex body plan (B) A soft-bodied structure (C) A lack of a circulatory system (D) A segmented body with a rigid cuticle 14. The phylum Kinorhyncha is known to contain approximately how many described species? (A) 100 (B) 500 (C) 200 (D) 1,000 15. Which of the following adaptations helps Kinorhyncha in their burrowing lifestyle? (A) A series of spines and bristles (B) Strong muscles (C) Highly developed eyes (D) Long antennae 16. Kinorhyncha have which of the following feeding habits? (A) Detritivorous (B) Carnivorous (C) Herbivorous (D) Filter feeders 17. Which of the following structures do Kinorhyncha use for sensory perception? (A) Statocysts (B) Compound eyes (C) Simple ocelli (D) Antennae 18. Kinorhyncha possess which type of respiratory system? (A) Gills (B) Lungs (C) Tracheae (D) Diffusion through the body surface 19. The head region of Kinorhyncha is equipped with: (A) Tentacles (B) Chelicerae (C) A pair of compound eyes (D) A retractable rostrum 20. Which statement about Kinorhyncha’s body structure is incorrect? (A) They have an outer cuticle that is molted (B) Their body is composed of multiple segments (C) They lack a body cavity (D) They have a well-defined head region 21. Kinorhyncha are considered part of which larger taxonomic group? (A) Deuterostomia (B) Lophotrochozoa (C) Ecdysozoa (D) Spiralia 22. What do Kinorhyncha primarily feed on? (A) Detritus and organic matter (B) Microalgae (C) Larger invertebrates (D) Bacteria 23. Kinorhyncha can be found in which of the following ecosystems? (A) Deep-sea environments (B) Coral reefs (C) All of the above (D) Intertidal zones 24. Which feature distinguishes Kinorhyncha from other marine invertebrates? (A) All of the above (B) Their retractable rostrum (C) Their burrowing habit (D) Their segmented body 25. Kinorhyncha are primarily found in which type of sediment? (A) Sandy (B) Muddy (C) Silty (D) Rocky 26. The primary ecological role of Kinorhyncha in their environment is: (A) Predation (B) Symbiosis (C) Competition (D) Decomposition 27. Kinorhyncha are known to have which type of development? (A) Indirect development with larval stages (B) Direct development (C) Alternation of generations (D) None of the above 28. Kinorhyncha are unique in that they: (A) Have a hardened shell (B) Are entirely parasitic (C) Can regenerate lost body parts (D) Have a cuticle that they molt 29. Which of the following is NOT a feature of Kinorhyncha? (A) Jointed appendages (B) Segmented body (C) Rostral structure (D) Presence of spines 30. The study of Kinorhyncha is important for understanding: (A) Evolutionary biology (B) Marine ecology (C) All of the above (D) Biodiversity