Phylum Rhombozoa MCQs January 8, 2026September 28, 2024 by u930973931_answers 30 min Score: 0 Attempted: 0/30 Subscribe 1. Rhombozoa are primarily known as: (A) Small marine worms (B) Parasitic organisms (C) Decomposers (D) Symbiotic organisms 2. Which habitat do Rhombozoa primarily inhabit? (A) Freshwater environments (B) Terrestrial ecosystems (C) Marine environments (D) Deep-sea trenches 3. The body structure of Rhombozoa is characterized by: (A) A simple sac-like form (B) A segmented body (C) A rigid exoskeleton (D) Jointed appendages 4. Rhombozoa are typically found living in the: (A) Intestines of fish (B) Sandy substrates (C) Gills of cephalopods (D) Open ocean 5. The primary mode of reproduction in Rhombozoa is: (A) Asexual reproduction (B) External fertilization (C) Internal fertilization (D) Budding 6. Rhombozoans are classified under which phylum? (A) Mollusca (B) Annelida (C) Cnidaria (D) Rhombozoa 7. Which of the following statements about Rhombozoa is TRUE? (A) They have a complex nervous system. (B) They exhibit radial symmetry. (C) They are a type of mollusk. (D) They lack specialized organs. 8. The larvae of Rhombozoa are called: (A) Free-swimming larvae (B) Veliger (C) Trochophore (D) Planula 9. Which of the following is a characteristic of Rhombozoa? (A) Bilateral symmetry (B) Simple body plan with no segmentation (C) Presence of a coelom (D) Complete digestive system 10. Rhombozoa primarily feed on: (A) Phytoplankton (B) Small invertebrates (C) Plant material (D) Bacteria and detritus 11. The reproductive structures of Rhombozoa are located in: (A) The proboscis (B) The tentacles (C) The gills of their hosts (D) The body cavity 12. Which of the following is NOT a feature of Rhombozoa? (A) Marine habitat (B) Lack of true tissues (C) Simple body organization (D) A muscular proboscis 13. The body of a typical Rhombozoan is divided into: (A) Head and trunk (B) Anterior and posterior regions (C) Segmented sections (D) A single sac-like structure 14. Which structure in Rhombozoa is primarily responsible for locomotion? (A) Tentacles (B) Cilia (C) Body muscles (D) Proboscis 15. Rhombozoa are classified as: (A) Parasitic organisms (B) Commensals (C) Predators (D) Detritivores 16. The study of Rhombozoa contributes to our understanding of: (A) Evolutionary biology (B) Marine ecology (C) Parasitology (D) All of the above 17. Rhombozoans are often found in association with: (A) Coral reefs (B) Bivalve mollusks (C) Sea urchins (D) Cephalopods 18. In terms of body size, Rhombozoans are generally: (A) Microscopic (B) Small (a few millimeters) (C) Medium-sized (up to 10 cm) (D) Large (over 1 meter) 19. Which of the following methods is used to study Rhombozoa in research? (A) Genetic analysis (B) Microscopy (C) Field surveys (D) All of the above 20. Rhombozoa exhibit which type of symmetry? (A) Asymmetry (B) Bilateral symmetry (C) Radial symmetry (D) None of the above 21. The ecological role of Rhombozoa in marine environments includes: (A) Prey for larger organisms (B) All of the above (C) Disease vectors (D) Nutrient cycling 22. Which of the following statements about Rhombozoa is FALSE? (A) They have complex reproductive systems. (B) They can reproduce asexually. (C) They are found in the gills of certain cephalopods. (D) They are generally small in size. 23. The primary threat to Rhombozoa populations is: (A) Habitat destruction (B) Climate change (C) All of the above (D) Overfishing 24. The nervous system of Rhombozoa is considered: (A) Complex and centralized (B) Absent (C) Simple and diffuse (D) Highly developed 25. Rhombozoa can be classified as: (A) Freshwater organisms (B) Marine invertebrates (C) Terrestrial organisms (D) None of the above 26. The primary mode of locomotion in Rhombozoa is through: (A) Gliding (B) Crawling (C) Floating (D) Swimming 27. The lifecycle of Rhombozoa typically involves: (A) Several larval stages (B) Direct development (C) A metamorphic phase (D) None of the above 28. Which of the following organisms are closely related to Rhombozoa? (A) Mollusks (B) Annelids (C) Cnidarians (D) Arthropods 29. The classification of Rhombozoa is primarily based on: (A) Genetic traits (B) Morphological characteristics (C) Ecological roles (D) All of the above 30. The significance of studying Rhombozoa includes understanding their: (A) All of the above (B) Host-parasite interactions (C) Role in marine ecosystems (D) Evolutionary adaptations