Hymenocephalida MCQs December 4, 2025September 30, 2024 by u930973931_answers 30 min Score: 0 Attempted: 0/30 Subscribe 1. What is the primary habitat of Hymenocephalida? (A) Terrestrial (B) Freshwater (C) Marine environments (D) Airborne 2. Hymenocephalida are commonly known as: (A) Horsehair worms (B) Ribbon worms (C) Flatworms (D) Roundworms 3. Which of the following is a characteristic feature of Hymenocephalida? (A) Free-living adult stage (B) Segmented body (C) Parasitic lifestyle (D) Complex eyes 4. The life cycle of Hymenocephalida typically involves: (A) Parasitic larval stages (B) Direct development (C) Multiple hosts (D) Asexual reproduction 5. Which of the following is a common host for Hymenocephalida larvae? (A) Fish (B) Amphibians (C) Mollusks (D) Insects 6. Hymenocephalida are primarily classified as: (A) Ectoparasites (B) Endoparasites (C) Free-living organisms (D) Mutualists 7. Which structure do Hymenocephalida use for attachment to their host? (A) Suckers (B) Hooks (C) Adhesive glands (D) Tentacles 8. What is the typical body shape of Hymenocephalida? (A) Flattened and broad (B) Irregular and lobed (C) Cylindrical and elongated (D) Disc-shaped 9. The reproductive strategy of Hymenocephalida is generally: (A) Asexual (B) Sexual (C) Parthenogenetic (D) Budding 10. Which of the following is a significant ecological role of Hymenocephalida? (A) Parasite of insects (B) Decomposer (C) Predator of fish (D) Filter feeder 11. Which of the following is NOT a characteristic of Hymenocephalida? (A) Thin cuticle (B) Simple nervous system (C) Parasitic larvae (D) Segmented body 12. The adult Hymenocephalida are typically found in which environment? (A) Freshwater streams (B) Deep sea (C) Desert soil (D) Oceanic surface 13. Hymenocephalida larvae typically infect: (A) Terrestrial mammals (B) Aquatic insects (C) Birds (D) Reptiles 14. Which of the following adaptations aids Hymenocephalida in their parasitic lifestyle? (A) Bright coloration (B) Thick body wall (C) Complex life cycle (D) High fecundity 15. Which of the following is a known genus of Hymenocephalida? (A) Hymenocephalus (B) Cordyceps (C) Nematomorpha (D) Caenorhabditis 16. Hymenocephalida are most closely related to which group? (A) Platyhelminthes (B) Annelida (C) Rotifera (D) Nematoda 17. What is the typical length range of Hymenocephalida? (A) 0.1 to 1 mm (B) 1 to 10 mm (C) Over 100 mm (D) 10 to 100 mm 18. Which of the following is a common characteristic of Hymenocephalida larvae? (A) They are free-living (B) They are planktonic (C) They are sessile (D) They are predatory 19. Hymenocephalida are primarily studied for their role in: (A) Aquaculture (B) Biodiversity (C) Pest control (D) Parasitology 20. The larvae of Hymenocephalida typically undergo which process before becoming adults? (A) Asexual reproduction (B) Metamorphosis (C) Direct development (D) Fission 21. The anatomy of Hymenocephalida includes which of the following features? (A) Complex digestive system (B) Exoskeleton (C) Lack of circulatory system (D) Jointed appendages 22. Which of the following is an important aspect of Hymenocephalida's ecological impact? (A) They regulate insect populations (B) They are major herbivores (C) They are primary producers (D) They recycle nutrients in soil 23. Hymenocephalida larvae can often be found in: (A) Rocky intertidal zones (B) Airborne dust (C) Surface water (D) Sediments of rivers and lakes 24. Which structure is primarily responsible for feeding in adult Hymenocephalida? (A) Digestive gland (B) Stomach (C) Pharynx (D) Mouthparts 25. The life cycle of Hymenocephalida typically requires how many hosts? (A) One (B) Three (C) Two (D) Four 26. What type of symbiotic relationship do Hymenocephalida have with their hosts? (A) Mutualistic (B) Commensal (C) Neutral (D) Parasitic 27. Which of the following is a factor affecting the distribution of Hymenocephalida? (A) Salinity (B) Temperature (C) Availability of hosts (D) All of the above 28. The mouth of Hymenocephalida is typically adapted for: (A) Absorbing nutrients (B) Grinding solid food (C) Filtering small particles (D) Sucking fluids 29. Which characteristic helps Hymenocephalida evade host immune responses? (A) Antigen masking (B) Thick cuticle (C) Rapid reproduction (D) Mimicry 30. Hymenocephalida are often used in research for studying: (A) Environmental change (B) Parasitic adaptations (C) Aquatic ecosystems (D) All of the above