Phylum Acoelomorpha MCQs December 5, 2025September 28, 2024 by u930973931_answers 30 min Score: 0 Attempted: 0/30 Subscribe 1. What distinguishes Acoelomorpha from other animal phyla? (A) Presence of a true coelom (B) Development of a notochord (C) Segmented body structure (D) Lack of a body cavity 2. Acoelomorpha are primarily found in which habitat? (A) Terrestrial environments (B) All of the above (C) Freshwater environments (D) Marine environments 3. Which of the following is a characteristic feature of Acoelomorpha? (A) Bilateral symmetry (B) Presence of a respiratory system (C) Presence of a segmented body (D) Exoskeleton 4. What type of digestive system do Acoelomorpha possess? (A) Incomplete digestive system (B) Complete digestive system (C) No digestive system (D) Filter-feeding system 5. Acoelomorpha are primarily: (A) Herbivores (B) Carnivores (C) Parasitic (D) Detritivores 6. The body of Acoelomorpha is typically covered by: (A) Mucus (B) Cuticle (C) Chitin (D) Scales 7. Acoelomorphs reproduce primarily through: (A) Asexual reproduction (B) Budding (C) Sexual reproduction (D) Fission 8. Which of the following is a common characteristic of Acoelomorpha? (A) Presence of tentacles (B) Presence of scales (C) Presence of a shell (D) Presence of cilia 9. The nervous system of Acoelomorpha is generally: (A) Complex and centralized (B) Diffuse with nerve cords (C) Lacking entirely (D) A simple nerve net 10. Acoelomorpha are most closely related to which of the following groups? (A) Annelids (B) Mollusks (C) Flatworms (D) Nematodes 11. The body plan of Acoelomorpha can be described as: (A) Radially symmetrical (B) Asymmetrical (C) Polyhedral (D) Bilaterally symmetrical 12. Which class is NOT typically associated with Acoelomorpha? (A) Nemertina (B) Acoela (C) Convoluta (D) Macrostomida 13. The Acoelomorpha are characterized by the absence of: (A) Circulatory system (B) Nervous system (C) Digestive system (D) Excretory system 14. In terms of ecological role, Acoelomorpha are often considered: (A) Decomposers (B) Scavengers (C) Primary producers (D) Predators 15. Which of the following methods do Acoelomorpha use for locomotion? (A) Jet propulsion (B) Swimming with fins (C) Ciliary movement (D) Muscular contractions 16. The body of Acoelomorpha lacks which of the following structures? (A) Organs (B) Tissues (C) Ectoderm (D) Body cavity 17. Which of the following statements about Acoelomorpha is TRUE? (A) They are exclusively freshwater organisms. (B) They have a well-defined head region. (C) They exhibit complex reproductive strategies. (D) They can regenerate lost body parts. 18. Acoelomorpha primarily feed on: (A) Algae and detritus (B) Other animals (C) Plankton (D) Bacteria 19. Acoelomorpha belong to which larger taxonomic group? (A) Deuterostomia (B) Ecdysozoa (C) Lophotrochozoa (D) Radiata 20. Which of the following structures is involved in excretion for Acoelomorpha? (A) Kidneys (B) Nephridia (C) Malpighian tubules (D) Flame cells 21. The reproductive strategy of Acoelomorpha can include: (A) Cross-fertilization (B) Parthenogenesis (C) All of the above (D) Asexual budding 22. What is the typical size range for Acoelomorpha species? (A) 1-10 mm (B) 5-10 cm (C) 1-2 mm (D) 1-1.5 m 23. Which of the following is a key feature of Acoelomorpha's anatomy? (A) A well-developed coelom (B) A simple body plan (C) A digestive cavity (D) A segmented structure 24. The sensory structures of Acoelomorpha are primarily located: (A) At the posterior end (B) At the anterior end (C) In the middle of the body (D) Scattered throughout the body 25. Acoelomorpha larvae typically develop from: (A) Metamorphosis (B) Buds (C) Fragmentation (D) Fertilized eggs 26. What is the primary mode of gas exchange in Acoelomorpha? (A) Through the cuticle (B) Through gills (C) Through lungs (D) Through specialized structures 27. The most significant threat to Acoelomorpha populations is: (A) Climate change (B) Pollution (C) Habitat destruction (D) Overfishing 28. Which of the following is NOT a mode of reproduction seen in Acoelomorpha? (A) Fragmentation (B) Budding (C) Sexual reproduction (D) Conjugation 29. Acoelomorpha play an important role in their ecosystems as: (A) Detritivores (B) Primary producers (C) Top predators (D) Parasites 30. Acoelomorpha are important for studying evolutionary relationships because they: (A) Are the most advanced invertebrates (B) Have complex nervous systems (C) Are entirely terrestrial (D) Exhibit traits linking flatworms to other phyla Classes of Acoelomorpha Acoela MCQS Nemertodermatida MCQS