Polyplacophora MCQs December 4, 2025September 30, 2024 by u930973931_answers 30 min Score: 0 Attempted: 0/30 Subscribe 1. What is the common name for members of the class Polyplacophora? (A) Clams (B) Sea slugs (C) Octopuses (D) Chitons 2. How many plates are typically found on the dorsal surface of a chiton? (A) 6 (B) 7 (C) 9 (D) 8 3. Which part of the chiton is used for scraping algae off rocks? (A) Mantle (B) Radula (C) Foot (D) Gills 4. What type of habitat do chitons primarily inhabit? (A) Freshwater (B) Terrestrial (C) Brackish water (D) Marine 5. The foot of a chiton is adapted for what function? (A) Swimming (B) Attachment to surfaces (C) Burrowing (D) Respiration 6. Which structure in chitons is responsible for gas exchange? (A) Mantle cavity (B) Gills (C) Foot (D) Radula 7. Chitons are primarily which type of feeder? (A) Herbivores (B) Carnivores (C) Filter feeders (D) Detritivores 8. What is the main predator of chitons? (A) Fish (B) Sea stars (C) Crabs (D) Seagulls 9. What is the outer covering of the plates in chitons made of? (A) Chitin (B) Calcium carbonate (C) Keratin (D) Silica 10. What do chitons use their foot for, aside from attachment? (A) Reproduction (B) Respiration (C) Feeding (D) Locomotion 11. How do chitons respond to threats from predators? (A) They swim away (B) They curl up into a ball (C) They burrow into the sand (D) They camouflage 12. Which of the following is a key characteristic of Polyplacophora? (A) Presence of multiple overlapping shells (B) Possession of a coiled shell (C) Soft-bodied (D) Possession of fins 13. What is the primary mode of locomotion for chitons? (A) Jet propulsion (B) Swimming (C) Crawling (D) Burrowing 14. What type of symmetry do chitons exhibit? (A) Radial symmetry (B) Bilateral symmetry (C) Asymmetry (D) Pentamerous symmetry 15. In which geological era did chitons first appear? (A) Paleozoic (B) Mesozoic (C) Cenozoic (D) Precambrian 16. Which of the following is a method of reproduction in chitons? (A) Budding (B) Fragmentation (C) Sexual reproduction (D) Asexual reproduction 17. What type of body cavity do chitons have? (A) Acoelomate (B) Pseudocoelomate (C) Coelomate (D) None of the above 18. What is the primary function of the mantle in chitons? (A) Digestion (B) Protection (C) Circulation (D) Respiration 19. Chitons are closely related to which group of mollusks? (A) Cephalopods (B) Bivalves (C) Gastropods (D) Scaphopods 20. Which of the following is a common genus of chitons? (A) Loligo (B) Mytilus (C) Acanthochitona (D) Nautilus 21. How do chitons attach themselves to rocky surfaces? (A) Using their foot (B) Using their tentacles (C) Using their radula (D) Using their siphon 22. The main diet of chitons consists of: (A) Detritus (B) Other mollusks (C) Small fish (D) Algae and other plant materials 23. What environmental condition is most critical for chitons? (A) Freshwater (B) Salinity levels (C) Temperature (D) Depth of water 24. Which feature allows chitons to resist desiccation when exposed to air? (A) Thick shell (B) Ability to burrow (C) Mucous secretion (D) Compact body 25. What anatomical feature allows chitons to have a strong grip on surfaces? (A) Radula (B) Suckers (C) Tentacles (D) Muscular foot 26. The structure used for excretion in chitons is called: (A) Nephridia (B) Gills (C) Mantle (D) Siphon 27. Which of the following adaptations helps chitons to withstand wave action? (A) Smooth shell (B) Small size (C) Ability to cling to rocks (D) Camouflage 28. The largest chiton species belongs to which genus? (A) Chiton (B) Cryptochiton (C) Mopalia (D) Ischnochiton 29. What type of ecological role do chitons primarily fulfill? (A) Predators (B) Herbivores (C) Decomposers (D) Parasites 30. Chitons can be found at what depth range in marine environments? (A) In freshwater only (B) Only in shallow waters (C) Only in deep sea (D) Intertidal to deep sea