- What is the primary habitat of Monhysterida nematodes?
- A) Freshwater
- B) Marine environments
- C) Terrestrial soil
- D) Airborne
Answer: B) Marine environments
- Monhysterida nematodes are primarily characterized by their:
- A) Long bodies
- B) Reduced body size
- C) Thick cuticle
- D) Anterior amphids
Answer: C) Thick cuticle
- Which of the following is a notable feature of Monhysterida nematodes?
- A) Presence of a stylet
- B) Spiny cuticle
- C) Simple body shape
- D) Well-developed pharynx
Answer: D) Well-developed pharynx
- The diet of Monhysterida nematodes typically includes:
- A) Fungi and bacteria
- B) Algae
- C) Detritus
- D) Plant roots
Answer: C) Detritus
- Which structure is often used for sensory perception in Monhysterida nematodes?
- A) Amphids
- B) Claspers
- C) Setae
- D) Pharyngeal bulb
Answer: A) Amphids
- Monhysterida nematodes are known to have a body shape that is:
- A) Flattened
- B) Cylindrical
- C) Irregular
- D) Disk-shaped
Answer: B) Cylindrical
- Which of the following genera is classified under the order Monhysterida?
- A) Caenorhabditis
- B) Monhystera
- C) Rhabditis
- D) Heterodera
Answer: B) Monhystera
- What is the significance of Monhysterida nematodes in sediment ecosystems?
- A) They are top predators.
- B) They contribute to nutrient cycling.
- C) They are parasitic on fish.
- D) They filter sediments.
Answer: B) They contribute to nutrient cycling.
- The reproduction of Monhysterida nematodes is typically:
- A) Asexual
- B) Sexual
- C) Parthenogenetic
- D) Budding
Answer: B) Sexual
- Which feature of Monhysterida nematodes aids in their identification?
- A) Smooth cuticle
- B) Presence of annulations
- C) Coloration
- D) Size
Answer: B) Presence of annulations
- Monhysterida nematodes can be classified as:
- A) Ectoparasites
- B) Endoparasites
- C) Free-living
- D) Symbiotic
Answer: C) Free-living
- Which of the following is NOT a characteristic of Monhysterida nematodes?
- A) Elongated bodies
- B) Thick cuticle
- C) Setae on the body
- D) Segmented body
Answer: D) Segmented body
- Which of the following reproductive strategies is observed in Monhysterida nematodes?
- A) Synchronous spawning
- B) Internal fertilization
- C) External fertilization
- D) Asexual budding
Answer: B) Internal fertilization
- Monhysterida nematodes are important in which ecological role?
- A) Herbivores
- B) Predators
- C) Decomposers
- D) Parasitic hosts
Answer: C) Decomposers
- The life cycle of Monhysterida nematodes typically includes:
- A) Multiple larval stages
- B) Direct development without a larval stage
- C) Complex interactions with host organisms
- D) Parthenogenetic reproduction
Answer: A) Multiple larval stages
- Which of the following statements about Monhysterida nematodes is true?
- A) They have a simple body structure.
- B) They are primarily freshwater.
- C) They play a role in sediment health.
- D) They are parasites of humans.
Answer: C) They play a role in sediment health.
- What is the typical size range for Monhysterida nematodes?
- A) 0.1 to 1 mm
- B) 1 to 10 mm
- C) 10 to 20 mm
- D) Over 20 mm
Answer: A) 0.1 to 1 mm
- Which of the following adaptations helps Monhysterida nematodes in their environment?
- A) Ability to swim
- B) Thick cuticle for protection
- C) Coloration for camouflage
- D) High metabolic rate
Answer: B) Thick cuticle for protection
- The amphids in Monhysterida nematodes are primarily used for:
- A) Locomotion
- B) Sensory functions
- C) Feeding
- D) Reproduction
Answer: B) Sensory functions
- Which of the following factors influences the distribution of Monhysterida nematodes?
- A) Temperature
- B) Soil moisture
- C) Organic matter availability
- D) All of the above
Answer: D) All of the above
- The presence of Monhysterida nematodes in sediment is often an indicator of:
- A) High salinity
- B) Healthy ecosystem
- C) Pollution levels
- D) Poor sediment structure
Answer: B) Healthy ecosystem.
- Which of the following best describes the ecological role of Monhysterida in sediment ecosystems?
- A) They are top predators.
- B) They are important decomposers.
- C) They are primary producers.
- D) They are symbionts of algae.
Answer: B) They are important decomposers.
- The ability of Monhysterida nematodes to survive in harsh environments is attributed to their:
- A) High reproductive rate
- B) Thick cuticle
- C) Small size
- D) Symbiotic relationships
Answer: B) Thick cuticle.
- Which of the following adaptations aids in the feeding of Monhysterida nematodes?
- A) Presence of a stylet
- B) Highly developed eyes
- C) Siphoning mechanism
- D) Large mouth
Answer: A) Presence of a stylet.
- Monhysterida nematodes are significant in sediment health because they:
- A) Compete with bacteria for nutrients
- B) Break down organic matter
- C) Filter sediments
- D) Prey on larger nematodes
Answer: B) Break down organic matter.
- Which of the following is a common method for studying Monhysterida nematodes?
- A) Microscopy
- B) Genetic sequencing
- C) Environmental sampling
- D) All of the above
Answer: D) All of the above.
- The primary mode of locomotion for Monhysterida nematodes is:
- A) Swimming
- B) Crawling
- C) Burrowing
- D) Floating
Answer: C) Burrowing.
- Which of the following statements about Monhysterida nematodes is true?
- A) They have a short life cycle.
- B) They are primarily herbivorous.
- C) They play a role in nutrient cycling.
- D) They are exclusively marine.
Answer: C) They play a role in nutrient cycling.
- Monhysterida nematodes are most commonly studied in relation to:
- A) Aquaculture
- B) Soil health
- C) Marine ecology
- D) Parasitology
Answer: B) Soil health.
- Which of the following statements about Monhysterida nematodes is true?
- A) They are primarily detritivores.
- B) They are host-specific parasites.
- C) They have complex life cycles.
- D) They are not found in sediments.
Answer: A) They are primarily detritivores.