Anthozoa MCQs January 8, 2026September 28, 2024 by u930973931_answers 30 min Score: 0 Attempted: 0/30 Subscribe 1. What is the primary characteristic of the class Anthozoa? (A) They are exclusively marine (B) They have a medusa form only (C) They have a polyp form only (D) They have both polyp and medusa forms 2. Which of the following is a well-known example of an Anthozoan? (A) Moon jellyfish (B) Box jellyfish (C) Sea anemone (D) Hydras 3. What type of symmetry do Anthozoans exhibit? (A) Bilateral symmetry (B) Asymmetry (C) Radial symmetry (D) Pentaradial symmetry 4. What structure do Anthozoans use for capturing prey? (A) Fins (B) Gills (C) Feeding appendages (D) Tentacles with cnidocytes 5. Which of the following is a key feature of the gastrovascular cavity in Anthozoans? (A) It is used for buoyancy (B) It functions in locomotion (C) It is used for digestion and circulation (D) It helps in respiration 6. What type of reproduction do most Anthozoans primarily use? (A) Asexual reproduction (B) Sexual reproduction (C) Fragmentation (D) Budding 7. What is the role of the mesoglea in Anthozoans? (A) Digestion (B) Support and buoyancy (C) Locomotion (D) Respiration 8. Which of the following types of corals belongs to the class Anthozoa? (A) Both hard and soft corals (B) Soft corals (C) Hard corals (D) Neither 9. Which of the following is a mutualistic relationship often found in Anthozoans? (A) Anthozoans and sea turtles (B) Anthozoans and sharks (C) Anthozoans and fish (D) Anthozoans and zooxanthellae 10. What is the primary habitat of most Anthozoans? (A) Freshwater (B) Terrestrial environments (C) Marine environments (D) Estuaries 11. What is the larval stage of Anthozoans called? (A) Polyp (B) Ephyra (C) Planula (D) Medusa 12. Which feature is common among all Anthozoans? (A) Presence of a medusa stage (B) Simple body structure with a central mouth (C) Ability to swim actively (D) Rigid external skeleton 13. Which of the following is NOT a subclass of Anthozoa? (A) Hexacorallia (B) Scyphozoa (C) Octocorallia (D) Ceriantharia 14. What do Anthozoans primarily feed on? (A) Algae (B) Larger marine mammals (C) Detritus (D) Small fish and zooplankton 15. How do Anthozoans typically respond to stimuli? (A) Complex nervous system (B) Fast locomotion (C) Simple nerve net (D) Color change 16. What is a significant ecological role of Anthozoans in marine ecosystems? (A) Habitat formation for other species (B) Primary producers (C) Decomposers (D) Predators 17. Which type of coral reef is primarily built by hard corals from the class Anthozoa? (A) Atoll reefs (B) All of the above (C) Barrier reefs (D) Fringing reefs 18. What is the main composition of coral reefs formed by Anthozoans? (A) Organic matter (B) Silica (C) Calcium carbonate (D) Sand 19. What unique feature do some Anthozoans have that aids in defense? (A) Camouflage (B) Bioluminescence (C) Stinging cells (nematocysts) (D) Speed 20. Which of the following is a characteristic of soft corals? (A) Flexible structure (B) Hard skeleton (C) Live in deep waters only (D) Lack symbiotic relationships 21. What is the significance of zooxanthellae to Anthozoans? (A) They provide food through photosynthesis (B) They aid in reproduction (C) They help with locomotion (D) They provide protection from predators 22. Which of the following is an adaptation of Anthozoans for survival in their environment? (A) High mobility (B) Stinging cells for prey capture (C) Rigid exoskeleton (D) Ability to burrow 23. What is a common reproductive method for many Anthozoans? (A) Fragmentation (B) Budding (C) Both A and B (D) Sexual reproduction only 24. Which of the following best describes the relationship between corals and reef ecosystems? (A) Corals are foundational species (B) Corals are non-essential (C) Corals harm other species (D) Corals are primary consumers 25. What type of environment do most Anthozoans thrive in? (A) Shallow, warm waters (B) Deep sea trenches (C) Polar regions (D) Freshwater lakes 26. Which subclass of Anthozoa includes the sea pens? (A) Octocorallia (B) Hexacorallia (C) Ceriantharia (D) Scyphozoa 27. What is the primary cause of coral bleaching in Anthozoans? (A) Temperature stress (B) Overfishing (C) Pollution (D) All of the above 28. What feature distinguishes hard corals from soft corals? (A) Formation of calcium carbonate skeletons (B) Presence of nematocysts (C) Habitat preferences (D) Feeding habits 29. How do Anthozoans obtain nutrients? (A) Both A and C (B) Absorption through the skin (C) Ingestion of prey (D) Photosynthesis 30. What is a major threat to Anthozoan populations worldwide? (A) Habitat destruction (B) Invasive species (C) Climate change (D) All of the above