Phylactolaemata MCQs December 4, 2025September 28, 2024 by u930973931_answers 30 min Score: 0 Attempted: 0/30 Subscribe 1. Phylactolaemata is a class within which phylum? (A) Bryozoa (B) Arthropoda (C) Mollusca (D) Cnidaria 2. Phylactolaemata are primarily found in which type of habitat? (A) Marine (B) Freshwater (C) Terrestrial (D) Brackish water 3. What is a key feature of Phylactolaemata? (A) They have a hard exoskeleton (B) They are free-living organisms (C) They form colonies (D) They lack a lophophore 4. The structure used for feeding in Phylactolaemata is called: (A) Tentacle (B) Mandible (C) Radula (D) Lophophore 5. Which of the following statements about Phylactolaemata is TRUE? (A) They are exclusively marine organisms (B) They do not reproduce sexually (C) They have a unique life cycle involving statoblasts (D) They lack specialized cells 6. The primary method of reproduction in Phylactolaemata is: (A) Budding (B) Sexual reproduction (C) Asexual reproduction (D) Fragmentation 7. The body of Phylactolaemata is primarily composed of: (A) Soft tissues (B) Calcium carbonate (C) Chitin (D) Silica 8. Phylactolaemata can often be found: (A) In soil (B) Floating in open water (C) Attached to submerged surfaces (D) On rocky substrates 9. What is the larval stage of Phylactolaemata called? (A) Cyphonautes (B) Planula (C) Trochophore (D) Nauplius 10. The protective structure formed by Phylactolaemata is known as: (A) Exoskeleton (B) Zooecium (C) Shell (D) Carapace 11. Phylactolaemata are characterized by their: (A) Segmented body (B) Lack of segmentation (C) Exoskeleton made of chitin (D) Well-developed nervous system 12. Which of the following best describes the feeding mechanism of Phylactolaemata? (A) Active hunting (B) Parasitism (C) Grazing (D) Filter feeding 13. The statoblasts in Phylactolaemata are used for: (A) Locomotion (B) Gas exchange (C) Feeding (D) Asexual reproduction 14. Which of the following is a common habitat for Phylactolaemata? (A) Coral reefs (B) Freshwater lakes and ponds (C) Intertidal zones (D) Deep sea environments 15. Phylactolaemata can be distinguished from Gymnolaemata by their: (A) Habitat (B) All of the above (C) Reproductive strategies (D) Body structure 16. The lophophore of Phylactolaemata is primarily used for: (A) Locomotion (B) Respiration (C) Feeding (D) Sensation 17. In terms of ecological importance, Phylactolaemata: (A) Act as primary producers (B) Compete with fish for food (C) Are top predators (D) Provide habitat for other organisms 18. The zooids of Phylactolaemata are usually: (A) Sessile (B) Solitary (C) Mobile (D) Parasitic 19. Which of the following is a characteristic reproductive feature of Phylactolaemata? (A) Budding (B) Presence of a larval stage (C) Internal fertilization (D) Direct development 20. Which of the following is an example of a Phylactolaemata species? (A) Bugula (B) Cristatella (C) Lingula (D) Nautilus 21. The structure that provides buoyancy in some Phylactolaemata is called: (A) Statoblast (B) Gas bladder (C) Chitinous layer (D) Zooecium 22. Which of the following statements about Phylactolaemata is FALSE? (A) They can reproduce both sexually and asexually (B) They have a complex nervous system (C) They have a colonial lifestyle (D) They are freshwater organisms 23. The feeding structure of Phylactolaemata is surrounded by: (A) Cilia (B) Gills (C) Palps (D) Tentacles 24. The body of a Phylactolaemata zooid typically includes: (A) A trunk and limbs (B) A lophophore and digestive cavity (C) A polyp and medusa stage (D) A shell and operculum 25. Phylactolaemata colonies can be: (A) Unattached (B) Buried in sediment (C) Free-floating (D) Attached to submerged vegetation or substrates 26. In Phylactolaemata, the process of statoblast formation is stimulated by: (A) Environmental changes (B) Predation (C) Disease (D) Overcrowding 27. Which of the following is a significant ecological role of Phylactolaemata in freshwater ecosystems? (A) Primary producers (B) All of the above (C) Habitat providers (D) Nutrient recyclers 28. Phylactolaemata are unique among bryozoans in that they: (A) Are exclusively found in freshwater environments (B) Do not produce statoblasts (C) Lack an exoskeleton (D) Have a marine lifestyle 29. Which feature helps Phylactolaemata in filter feeding? (A) Lophophore (B) Radula (C) Tentacles (D) Gills 30. Statoblasts are important for the survival of Phylactolaemata because they: (A) Aid in locomotion (B) Allow for asexual reproduction (C) Provide buoyancy (D) Protect against predation