Dicyemida MCQs December 3, 2025September 30, 2024 by u930973931_answers 30 min Score: 0 Attempted: 0/30 Subscribe 1. What is the primary habitat of Dicyemida? (A) Arctic regions (B) Freshwater environments (C) Terrestrial habitats (D) Marine environments 2. Dicyemida are primarily known for their relationship with which type of organisms? (A) Crustaceans (B) Fish (C) Marine mammals (D) Cephalopods 3. Which phylum do Dicyemida belong to? (A) Platyhelminthes (B) Cnidaria (C) Rhombozoa (D) Mollusca 4. What is the body structure of Dicyemida primarily characterized by? (A) Segmented body plan (B) Acoelomate structure (C) Complex organ systems (D) A rigid exoskeleton 5. Dicyemida reproduce by which of the following methods? (A) Budding (B) Asexual fission and sexual reproduction (C) Fragmentation (D) Binary fission only 6. What type of cells are predominantly found in the body of Dicyemida? (A) Epithelial cells (B) Blood cells (C) Neuronal cells (D) Muscle-like cells 7. Dicyemida are considered to be which of the following? (A) Parasitic (B) Symbiotic (C) Free-living (D) Commensal 8. Which developmental stage is unique to Dicyemida? (A) Trochophore (B) Zygote (C) Planula (D) Rhombogen 9. Dicyemida typically inhabit which part of their host? (A) Digestive system (B) Renal sac (C) Muscles (D) Nervous tissue 10. How do Dicyemida obtain nutrients? (A) Photosynthesis (B) Predation (C) Filter feeding (D) Absorption from the host 11. What is the approximate size range of Dicyemida? (A) Several centimeters (B) Several millimeters (C) Microscopic (D) Centimeter range 12. Dicyemida have been classified based on which criteria? (A) Morphological features (B) Color and size (C) Genetic material (D) Geographic distribution 13. What type of body organization do Dicyemida exhibit? (A) Multicellular with organ systems (B) Colonial organization (C) Complex organ systems (D) Simple tissue organization 14. What is the function of the rhombogen stage in Dicyemida? (A) Nutrient absorption (B) Reproduction (C) Host attachment (D) Mobility 15. Which of the following describes the ecological role of Dicyemida? (A) Parasites (B) Primary producers (C) Decomposers (D) Symbionts 16. Dicyemida are primarily found in which type of marine animals? (A) Sharks (B) Crabs (C) Sea turtles (D) Squid 17. Which of the following is true about the nervous system of Dicyemida? (A) They possess a brain-like structure (B) They have a complex nervous system (C) They have a decentralized nerve net (D) They lack a true nervous system 18. Which type of environment do Dicyemida thrive in? (A) Intertidal zones (B) Freshwater lakes (C) Coastal estuaries (D) Marine environments 19. Which of the following is a characteristic feature of Dicyemida? (A) Presence of a circulatory system (B) Presence of a digestive cavity (C) Absence of complex organ systems (D) Well-defined body segments 20. Dicyemida are classified under which subclass? (A) Cestoda (B) Trematoda (C) Monogenea (D) Rhombozoa 21. Which of the following best describes the life cycle of Dicyemida? (A) Direct development (B) Simple lifecycle with one stage (C) Alternation of generations (D) Complex lifecycle with multiple stages 22. What is a common method of studying Dicyemida in research? (A) Behavioral observation (B) Genetic sequencing (C) Microscopy (D) Field surveys 23. What adaptations help Dicyemida survive within their hosts? (A) Thick outer shells (B) Simple body structure (C) Strong muscular systems (D) Complex respiratory systems 24. Which type of organism can be a host for Dicyemida? (A) Cephalopods (B) Crustaceans (C) Fish (D) Coral 25. The primary ecological impact of Dicyemida on their hosts is generally considered to be? (A) Beneficial (B) Harmful (C) Neutral (D) Symbiotic 26. Dicyemida are characterized by their lack of which system? (A) Muscular system (B) Digestive system (C) Reproductive system (D) Excretory system 27. Which of the following best describes Dicyemida's relationship with their hosts? (A) Parasitic (B) Mutualistic (C) Commensal (D) Symbiotic 28. What is the most common reproductive strategy observed in Dicyemida? (A) Sexual reproduction only (B) Asexual reproduction (C) Budding (D) Fragmentation 29. Dicyemida have a body that is typically what shape? (A) Tubular (B) Flat (C) Circular (D) Irregular 30. The study of Dicyemida can provide insight into which aspect of marine biology? (A) Coral reef dynamics (B) Fish behavior (C) Host-parasite interactions (D) Nutrient cycling