Phylum Ctenophora MCQs December 5, 2025September 28, 2024 by u930973931_answers 30 min Score: 0 Attempted: 0/30 Subscribe 1. What is the common name for organisms in the phylum Ctenophora? (A) Jellyfish (B) Corals (C) Sea anemones (D) Comb jellies 2. Which of the following structures is unique to ctenophores? (A) Nematocysts (B) Ctenes (C) Tentacles (D) Polyp 3. Ctenophores are primarily found in which type of habitat? (A) Freshwater (B) Marine environments (C) Terrestrial (D) All of the above 4. What type of symmetry do ctenophores exhibit? (A) Bilateral symmetry (B) Pentaradial symmetry (C) Asymmetry (D) Radial symmetry 5. Which of the following is a characteristic feature of ctenophores? (A) Bioluminescence (B) Possession of a skeleton (C) Solid body structure (D) No tentacles 6. What type of feeding strategy do ctenophores use? (A) Filter feeding (B) Photosynthesis (C) Predatory feeding (D) Parasitism 7. What is the primary means of locomotion in ctenophores? (A) Jet propulsion (B) Ciliary movement (C) Swimming with appendages (D) Crawl 8. Ctenophores can be distinguished from jellyfish by the presence of which structure? (A) Medusa (B) Cnidocytes (C) Tentacles (D) Ctenes 9. What is the function of the cilia on ctenophores? (A) Sensory reception (B) Locomotion (C) Prey capture (D) Reproduction 10. Which of the following statements about ctenophores is TRUE? (A) They are primarily terrestrial. (B) They possess stinging cells. (C) They are mainly carnivorous. (D) They lack a digestive system. 11. Which class includes the largest species of ctenophores? (A) Tentaculata (B) Cydippida (C) Nuda (D) Lobata 12. What are the two main forms of ctenophores? (A) Polyp and medusa (B) Free-swimming and attached (C) Cydippid and lobate (D) Adult and larval 13. Ctenophores are known to have what type of reproductive strategy? (A) Sexual reproduction only (B) Asexual reproduction only (C) Both asexual and sexual reproduction (D) Budding only 14. What is the term used for the sticky cells used by ctenophores to capture prey? (A) Cnidocytes (B) Ctenes (C) Tentacles (D) Colloblasts 15. Which of the following organisms is a common example of a ctenophore? (A) Aurelia aurita (moon jelly) (B) Metridium (sea anemone) (C) Pleurobrachia (sea gooseberry) (D) Acropora (coral) 16. What is the ecological role of ctenophores in marine ecosystems? (A) Primary producers (B) Decomposers (C) Predators of zooplankton (D) Herbivores 17. Ctenophores are most closely related to which of the following groups? (A) Cnidarians (B) Mollusks (C) Echinoderms (D) Flatworms 18. Which of the following best describes the body structure of ctenophores? (A) Composed of hard exoskeleton (B) Soft-bodied and gelatinous (C) Rigid and segmented (D) Calcified 19. What kind of environmental conditions do ctenophores prefer? (A) Cold, dark waters (B) Polluted waters (C) Deep ocean trenches (D) Warm, shallow waters 20. Ctenophores can exhibit which type of coloration? (A) Bright fluorescent colors (B) Only brown (C) Transparent only (D) Black and white only 21. The ability of ctenophores to glow in the dark is known as: (A) Luminescence (B) Phosphorescence (C) Fluorescence (D) Bioluminescence 22. Which of the following structures is NOT found in ctenophores? (A) Tentacles (B) Cilia (C) Colloblasts (D) Cnidocytes 23. Which ctenophore is known for its ability to swim backwards? (A) Mnemiopsis leidyi (B) Pleurobrachia (C) Lobata (D) Cydippida 24. What is the primary component of the body of ctenophores? (A) Gelatinous substance (B) Chitin (C) Calcium carbonate (D) Silica 25. How do ctenophores capture their prey? (A) Using sharp beaks (B) Using stinging cells (C) Using sticky cells called colloblasts (D) By engulfing them whole 26. What is the typical size range for ctenophores? (A) Varies widely, from mm to several meters (B) 5 cm to 50 cm (C) 1 m to 2 m (D) 1 mm to 5 cm 27. Which characteristic distinguishes the class Nuda within Ctenophora? (A) Absence of tentacles (B) Presence of long tentacles (C) Presence of ctenes (D) Ability to photosynthesize 28. Ctenophores are primarily: (A) Carnivores (B) Herbivores (C) Omnivores (D) Detritivores 29. What is the main predator of ctenophores in the marine ecosystem? (A) Sea turtles (B) Larger fish (C) None of the above (D) Other ctenophores 30. Which aspect of ctenophores makes them unique compared to other marine invertebrates? (A) Their ability to produce venom (B) Their lack of nervous systems (C) Their use of cilia for swimming (D) Their gelatinous body structure