Aplacophora MCQs January 8, 2026September 30, 2024 by u930973931_answers 30 min Score: 0 Attempted: 0/30 Subscribe 1. What is the common name for members of the class Aplacophora? (A) Cephalopods (B) Bivalves (C) Snails (D) Worm-like mollusks 2. Which of the following describes the body structure of Aplacophora? (A) Segmented body with a shell (B) Smooth, elongated, and unsegmented (C) Coiled and spiral-shaped (D) Flattened and leaf-like 3. What type of habitat do Aplacophora primarily inhabit? (A) Freshwater environments (B) Deep-sea marine environments (C) Terrestrial habitats (D) Coastal tidal zones 4. Which feeding method is common among Aplacophora? (A) Predation (B) Filter feeding (C) Deposit feeding (D) Herbivory 5. Aplacophora lack which of the following structures? (A) Shell (B) Gills (C) Foot (D) Radula 6. Which of the following features is characteristic of Aplacophora? (A) Presence of tentacles (B) Bioluminescent capabilities (C) A spiny or scaly outer surface (D) Complex eyes 7. What is the primary ecological role of Aplacophora? (A) Predators (B) Primary producers (C) Scavengers and decomposers (D) Parasites 8. Aplacophora are most closely related to which other class of mollusks? (A) Polyplacophora (B) Bivalvia (C) Gastropoda (D) Cephalopoda 9. How do Aplacophora reproduce? (A) External fertilization (B) Asexually through budding (C) Internal fertilization (D) Fragmentation 10. What type of circulatory system do Aplacophora possess? (A) Open circulatory system (B) Closed circulatory system (C) No circulatory system (D) Hemocoel 11. What structure is primarily responsible for locomotion in Aplacophora? (A) Tentacles (B) Foot (C) Cilia (D) Siphon 12. Which of the following is a common genus of Aplacophora? (A) Chaetoderma (B) Dentalium (C) Nautilus (D) Helix 13. What type of symmetry do Aplacophora exhibit? (A) Asymmetry (B) Radial symmetry (C) Bilateral symmetry (D) None of the above 14. The body of Aplacophora is covered with what type of structure? (A) Scales (B) Tentacles (C) Spicules (D) Shells 15. What is the larval stage of Aplacophora called? (A) Veliger (B) Trochophore (C) Nauplius (D) Zoea 16. Aplacophora typically feed on: (A) Coral (B) Plankton (C) Algae and detritus (D) Small fish 17. What kind of reproduction strategy do Aplacophora employ? (A) Sexual reproduction (B) Asexual reproduction (C) Budding (D) Parthenogenesis 18. The nervous system of Aplacophora can be described as: (A) Simple and decentralized (B) Highly developed with a brain (C) Non-functional (D) Extremely complex 19. Which of the following adaptations helps Aplacophora in their environment? (A) Ability to swim (B) Camouflage (C) Burrowing behavior (D) Both B and C 20. What is the main diet of Aplacophora? (A) Coral (B) Algae (C) Detritus and microorganisms (D) Larger prey like fish 21. Which feature is notable about the locomotion of Aplacophora? (A) They swim using fins (B) They crawl using a muscular foot (C) They glide on mucus (D) They use cilia on their body surface 22. The shell-less condition of Aplacophora is believed to be: (A) A primitive characteristic (B) An evolutionary adaptation (C) A developmental anomaly (D) A result of environmental pressures 23. What type of digestive system do Aplacophora possess? (A) Complete digestive tract (B) Incomplete digestive tract (C) No digestive system (D) Complex multi-chambered system 24. Which of the following structures is primarily used for excretion in Aplacophora? (A) Gills (B) Mantle (C) Nephridia (D) Foot 25. Aplacophora are primarily: (A) Terrestrial (B) Freshwater (C) Parasites (D) Marine 26. What role do Aplacophora play in the marine ecosystem? (A) Primary producers (B) Herbivores (C) Predators (D) Scavengers 27. Which of the following is a characteristic of Aplacophora’s reproductive strategy? (A) They exhibit parental care (B) They have a high reproductive rate (C) They produce a single offspring (D) They are hermaphroditic 28. Aplacophora can be found at what depths in the ocean? (A) Up to several thousand meters deep (B) Shallow coastal waters (C) Only at the surface (D) Only in tidal pools 29. What is the main ecological impact of Aplacophora? (A) They contribute to coral reef building (B) They create habitats for other organisms (C) They provide food for larger predators (D) They break down organic matter 30. Which of the following adaptations helps Aplacophora thrive in their environment? (A) Their spicules providing protection (B) Their smooth body allowing for easy burrowing (C) Their ability to produce toxins (D) Their complex camouflage