Phylum Phoronida MCQs January 8, 2026September 28, 2024 by u930973931_answers 30 min Score: 0 Attempted: 0/30 Subscribe 1. Phoronida are commonly known as: (A) Horseshoe worms (B) Sea cucumbers (C) Tube worms (D) Coral 2. The primary habitat of phoronids is: (A) Marine environments (B) Freshwater (C) Terrestrial ecosystems (D) Deep-sea vents 3. The body of a phoronid is primarily divided into: (A) Proboscis and trunk (B) Head and tail (C) Mantle and shell (D) Tentacles and foot 4. Phoronids possess a unique structure called the lophophore, which is primarily used for: (A) Locomotion (B) Feeding and respiration (C) Defense (D) Reproduction 5. What type of symmetry do phoronids exhibit? (A) Asymmetrical (B) Radial (C) Pentamerous (D) Bilateral 6. The larval stage of phoronids is known as a: (A) Nauplius (B) Veliger (C) Planula (D) Trochophore 7. Which of the following statements about phoronids is true? (A) They have a complex central nervous system. (B) They exhibit complex social behavior. (C) They have a hardened exoskeleton. (D) They are entirely sessile as adults. 8. Phoronids are classified within which larger animal phylum? (A) Annelida (B) Mollusca (C) Lophophorata (D) Cnidaria 9. The main mode of reproduction in phoronids is: (A) Asexual budding (B) Sexual reproduction (C) Fission (D) Regeneration 10. Phoronids are primarily characterized by their: (A) Ability to swim freely in the water column (B) Complex digestive systems (C) Ability to photosynthesize (D) Tube-dwelling lifestyle 11. The primary function of the phoronid’s coelom is: (A) Storage of nutrients (B) Circulation of fluids (C) Protection of internal organs (D) Support and locomotion 12. Which of the following features is NOT characteristic of phoronids? (A) Presence of a shell (B) Possession of a lophophore (C) Tube-dwelling habit (D) Bilateral symmetry 13. In phoronids, the lophophore is used primarily for: (A) Locomotion (B) Sensory perception (C) Excretion (D) Feeding 14. Phoronids are typically found in: (A) Soft sediments (B) Rocky shores (C) Sandy substrates (D) Coral reefs 15. What is the role of the nephridia in phoronids? (A) Excretion (B) Respiration (C) Circulation (D) Digestion 16. Phoronids are most closely related to which other group of organisms? (A) Mollusks (B) Echinoderms (C) Annelids (D) Cnidarians 17. A common genus of phoronids is: (A) Acanthogobius (B) Echinodorus (C) Phoronis (D) Nereis 18. The primary purpose of the phoronid’s tube is to: (A) Provide shelter and protection (B) Facilitate swimming (C) Aid in reproduction (D) Assist in feeding 19. Phoronids typically feed on: (A) Detritus and sediment (B) Larger marine animals (C) Algae and plankton (D) Other phoronids 20. Which statement about phoronids is FALSE? (A) They have a simple body plan. (B) They can exhibit both asexual and sexual reproduction. (C) They live in tubes that they secrete. (D) They have complex organ systems. 21. The unique feature of the phoronid’s proboscis is that it is: (A) Used for locomotion (B) Hollow (C) Retractable (D) Photosynthetic 22. The lifespan of phoronids can range from: (A) Several years to decades (B) Few months to a year (C) A few weeks (D) Indefinite 23. Phoronids can be found in which marine zone? (A) Intertidal zone (B) Deep-sea zone (C) Open ocean (D) Coastal lagoons 24. Which best describes the reproductive strategy of phoronids? (A) External fertilization (B) Simultaneous hermaphroditism (C) Sequential hermaphroditism (D) Internal fertilization 25. The primary ecological role of phoronids in their habitat is as: (A) Primary producers (B) Predators (C) Decomposers (D) Filter feeders 26. The musculature of phoronids is primarily used for: (A) Pumping blood (B) Digestion (C) Movement of the lophophore (D) Respiration 27. Phoronids have which type of digestive system? (A) Incomplete digestive system (B) Complete digestive system (C) No digestive system (D) Compartmentalized digestive system 28. Phoronids are part of which evolutionary group? (A) Deuterostomes (B) Protostomes (C) Acoelomates (D) Pseudocoelomates 29. Which structure is critical for gas exchange in phoronids? (A) Gills (B) Skin (C) Lophophore (D) Coelomic fluid 30. Phoronids are important indicators of: (A) Biodiversity (B) Climate change effects (C) Water quality in marine ecosystems (D) Ocean acidity levels