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