Agnatha MCQs January 8, 2026September 28, 2024 by u930973931_answers 30 min Score: 0 Attempted: 0/30 Subscribe 1. What is the primary characteristic of Agnatha? (A) They have jaws (B) They are amphibians (C) They have a bony skeleton (D) They are jawless fish 2. Which of the following animals belong to the class Agnatha? (A) Sharks (B) Lampreys (C) Salmon (D) Frogs 3. What type of skeleton do Agnatha possess? (A) Bony skeleton (B) Hydrostatic skeleton (C) Composite skeleton (D) Cartilaginous skeleton 4. Which of the following is a characteristic feature of Agnatha? (A) Paired fins (B) Gills (C) Lungs (D) Scales 5. Agnatha primarily inhabit which of the following environments? (A) Terrestrial (B) Desert (C) Freshwater and marine (D) Arboreal 6. What is the main dietary habit of many Agnatha species? (A) Herbivorous (B) Parasitic (C) Filter-feeding (D) Carnivorous 7. Which of the following is a subclass of Agnatha? (A) Petromyzontidae (B) Elasmobranchii (C) Actinopterygii (D) Amphibia 8. What is the primary mode of reproduction in Agnatha? (A) External fertilization (B) Asexual reproduction (C) Internal fertilization (D) Budding 9. Which organ is primarily responsible for respiration in Agnatha? (A) Lungs (B) Skin (C) Gills (D) Trachea 10. How do Agnatha typically attach to their hosts? (A) Using fins (B) Using their tails (C) Using tentacles (D) Using sucker-like mouths 11. Which of the following best describes the mouth of Agnatha? (A) Small and has no jaws (B) Large and filled with teeth (C) Beak-like (D) Protruding jaw 12. What is the typical body shape of Agnatha? (A) Cylindrical (B) Flattened (C) Disc-shaped (D) Boxy 13. Which of the following is NOT a feature of Agnatha? (A) Presence of paired fins (B) Presence of a notochord (C) Lack of jaws (D) Presence of gills 14. Which of the following Agnatha is known for its parasitic behavior? (A) Both A and B (B) Lamprey (C) Hagfish (D) None of the above 15. What type of circulatory system do Agnatha have? (A) Open circulatory system (B) No circulatory system (C) Closed circulatory system (D) Lymphatic system 16. Which of the following is a common habitat for hagfish? (A) Shallow waters (B) Coral reefs (C) Freshwater lakes (D) Deep ocean 17. What is the primary function of the slime produced by hagfish? (A) To aid in locomotion (B) To deter predators (C) To attract prey (D) To assist in respiration 18. Which of the following best describes the eyes of Agnatha? (A) Highly developed (B) Non-functional (C) Compound (D) Simple and not well-developed 19. Which of the following statements about Agnatha is true? (A) They have a fully developed jaw (B) They possess scales (C) They are the most primitive vertebrates (D) They can live both in water and on land 20. What is the approximate number of species in the class Agnatha? (A) 100-150 (B) 30-50 (C) Less than 20 (D) Over 200 21. Which type of Agnatha is known for its ability to produce a large amount of slime? (A) Hagfish (B) Lamprey (C) Both A and B (D) None of the above 22. What is the ecological role of Agnatha in marine ecosystems? (A) Predators (B) Scavengers (C) Filter feeders (D) Herbivores 23. What type of feeding mechanism do lampreys utilize? (A) Sucking blood (B) Grazing (C) Filter feeding (D) Hunting 24. What is the main habitat preference for lampreys? (A) Rocky shorelines (B) Open ocean (C) Freshwater rivers and lakes (D) Coral reefs 25. What is the primary reproductive strategy of Agnatha? (A) Oviparous (B) Viviparous (C) Ovoviviparous (D) Budding 26. Which of the following is a significant characteristic of hagfish? (A) They can tie themselves in knots (B) They have a complex jaw structure (C) They have highly developed eyes (D) They have bony fins 27. What feature do both lampreys and hagfish share? (A) They both have jaws (B) They both have cartilaginous skeletons (C) They both are filter feeders (D) They both have paired fins 28. How do lampreys typically attach to their hosts? (A) Using hooks (B) Using teeth (C) Using suckers (D) Using fins 29. Which of the following adaptations helps Agnatha survive in their environment? (A) Colorful patterns (B) Strong jaws (C) The ability to produce slime (D) Sharp teeth 30. What is a key difference between lampreys and hagfish? (A) Lampreys have a complex circulatory system, while hagfish do not (B) Hagfish have a true vertebral column, while lampreys do not (C) Lampreys are exclusively freshwater, while hagfish are marine (D) Hagfish are predators, while lampreys are scavengers