Desmodoridae MCQs December 4, 2025September 30, 2024 by u930973931_answers 30 min Score: 0 Attempted: 0/30 Subscribe 1. What is the primary habitat of Desmodoridae nematodes? (A) Freshwater (B) Terrestrial soil (C) Marine sediments (D) Airborne 2. Desmodoridae nematodes are commonly associated with which type of feeding strategy? (A) Predatory (B) Herbivorous (C) Parasitic (D) Saprophytic 3. Which of the following is a characteristic feature of Desmodoridae? (A) Well-developed amphids (B) Segmented body (C) Thick cuticle (D) Reduced pharynx 4. Desmodoridae nematodes are primarily known for their role in: (A) Plant parasitism (B) Animal diseases (C) Decomposition of organic matter (D) Water filtration 5. Which structure is prominent in the anatomy of Desmodoridae nematodes? (A) Pharyngeal bulb (B) Setae (C) Stylet (D) Claspers 6. The reproductive strategy of Desmodoridae nematodes is primarily: (A) Asexual (B) Budding (C) Parthenogenetic (D) Sexual 7. Which of the following genera belongs to the family Desmodoridae? (A) Rhabditis (B) Desmodora (C) Caenorhabditis (D) Heterodera 8. Desmodoridae nematodes are primarily found in: (A) Acidic environments (B) Saline water (C) Alkaline soils (D) Anaerobic conditions 9. Which of the following is a significant research application for Desmodoridae nematodes? (A) Ecological studies of marine environments (B) Medical research on human parasites (C) Agricultural pest control (D) Genetic engineering 10. The body shape of Desmodoridae nematodes is typically: (A) Disk-shaped (B) Flattened (C) Irregular (D) Cylindrical 11. Which of the following statements about Desmodoridae is true? (A) They are primarily freshwater species (B) They have a complex life cycle involving multiple hosts (C) They play a significant role in nutrient cycling in marine ecosystems (D) They lack a pharynx 12. What is the typical diet of Desmodoridae nematodes? (A) Fungi (B) Algae (C) Detritus and microorganisms (D) Plant roots 13. Desmodoridae nematodes are important indicators of: (A) Marine ecosystem health (B) Soil fertility (C) Water pollution (D) Climate change 14. The larvae of Desmodoridae nematodes undergo which type of development? (A) Direct development (B) Indirect development (C) Fragmentation (D) Parthenogenesis 15. Which of the following features distinguishes Desmodoridae from other nematode families? (A) Thick cuticle with annulations (B) High diversity of feeding strategies (C) Complex reproductive organs (D) Ability to survive extreme temperatures 16. The ecological role of Desmodoridae nematodes primarily involves: (A) Breaking down organic material (B) Predation on larger organisms (C) Competing with fish for resources (D) Consuming algae 17. Which of the following adaptations helps Desmodoridae nematodes survive in sediment? (A) Ability to burrow (B) Streamlined body shape (C) Modified feeding structures (D) Air sacs 18. Desmodoridae nematodes can be classified as: (A) Ectoparasites (B) Endoparasites (C) Symbiotic (D) Free-living 19. The presence of Desmodoridae nematodes in marine sediments indicates: (A) High organic matter availability (B) Pollution levels (C) High salinity levels (D) Alkaline pH 20. The amphids in Desmodoridae nematodes are primarily used for: (A) Locomotion (B) Feeding (C) Sensory functions (D) Reproduction 21. Which of the following methods is commonly used to study Desmodoridae nematodes in laboratory settings? (A) Microscopy (B) All of the above (C) DNA barcoding (D) Genetic sequencing 22. The typical lifespan of Desmodoridae nematodes can vary from: (A) Days to weeks (B) Months to years (C) Weeks to months (D) Days to years 23. Which of the following is NOT a common feature of Desmodoridae nematodes? (A) Thick cuticle (B) Complex sensory structures (C) Presence of a well-defined stylet (D) Reduced number of body segments 24. Desmodoridae nematodes are most commonly studied in relation to: (A) Aquaculture (B) Soil health (C) Parasitology (D) Marine ecology 25. Which of the following features is characteristic of the Desmodoridae life cycle? (A) Multiple larval stages (B) Parthenogenetic reproduction (C) Complex interactions with host organisms (D) Direct development without a larval stage 26. Desmodoridae nematodes contribute to nutrient cycling by: (A) Competing with plants for nutrients (B) Filtering sediments (C) Preying on larger nematodes (D) Breaking down complex organic matter 27. The body structure of Desmodoridae can be described as: (A) Highly segmented (B) Flattened and leaf-like (C) Smooth and cylindrical (D) Irregularly shaped 28. Which of the following is a key characteristic of the reproductive strategy in Desmodoridae? (A) Synchronous spawning (B) External fertilization (C) Asexual budding (D) Internal fertilization 29. Which of the following best describes the ecological role of Desmodoridae in marine ecosystems? (A) They are top predators (B) They are primary producers (C) They are important decomposers (D) They are symbionts of fish 30. The sensitivity of Desmodoridae nematodes to environmental changes makes them useful as: (A) Symbiotic organisms (B) Food sources (C) Aquatic pests (D) Pollution indicators