- What is the defining characteristic of the class Nuda?
- A) They possess tentacles.
- B) They lack tentacles.
- C) They have a hard exoskeleton.
- D) They are exclusively marine organisms.
Answer: B) They lack tentacles.
- Which of the following organisms is classified under Nuda?
- A) Comb jellies
- B) Sea anemones
- C) Mnemiopsis leidyi (the sea walnut)
- D) Box jellyfish
Answer: C) Mnemiopsis leidyi (the sea walnut)
- What type of symmetry do Nuda exhibit?
- A) Bilateral symmetry
- B) Radial symmetry
- C) Asymmetry
- D) Pentaradial symmetry
Answer: B) Radial symmetry
- How do Nuda primarily capture their prey?
- A) Using sticky tentacles
- B) Using a mucus layer
- C) By engulfing it
- D) With specialized feeding structures
Answer: B) Using a mucus layer
- What role do cilia play in the biology of Nuda?
- A) They are used for locomotion.
- B) They assist in digestion.
- C) They provide structural support.
- D) They capture prey.
Answer: A) They are used for locomotion.
- Which of the following best describes the body structure of Nuda?
- A) Rigid and segmented
- B) Soft-bodied and gelatinous
- C) Hard-shelled
- D) Chitinous
Answer: B) Soft-bodied and gelatinous
- What type of reproduction is commonly observed in Nuda?
- A) Asexual reproduction
- B) Sexual reproduction
- C) Budding
- D) Fragmentation
Answer: B) Sexual reproduction
- What is the primary habitat of Nuda?
- A) Freshwater lakes
- B) Marine environments
- C) Terrestrial environments
- D) Brackish water
Answer: B) Marine environments
- Which of the following statements is true regarding Nuda?
- A) They are typically found in freshwater.
- B) They are primarily benthic organisms.
- C) They are often free-floating in the ocean.
- D) They are all bioluminescent.
Answer: C) They are often free-floating in the ocean.
- What method of locomotion do Nuda primarily use?
- A) Jet propulsion
- B) Cilia beating
- C) Swimming with muscular contractions
- D) Crawling
Answer: B) Cilia beating
- What ecological role do Nuda play in marine ecosystems?
- A) Primary producers
- B) Predators of small zooplankton
- C) Decomposers
- D) Herbivores
Answer: B) Predators of small zooplankton
- Which of the following structures is unique to Nuda?
- A) Comb rows
- B) Tentacles
- C) Stinging cells
- D) Mesoglea
Answer: A) Comb rows
- How do Nuda respond to environmental changes?
- A) They migrate to different habitats.
- B) They exhibit rapid adaptation.
- C) They are highly sensitive to pollution.
- D) They thrive in extreme conditions.
Answer: C) They are highly sensitive to pollution.
- What type of diet do Nuda typically have?
- A) Herbivorous
- B) Carnivorous
- C) Omnivorous
- D) Detritivorous
Answer: B) Carnivorous
- Which group of organisms is most closely related to Nuda?
- A) Hydrozoa
- B) Scyphozoa
- C) Tentaculata
- D) Anthozoa
Answer: C) Tentaculata
- What is the significance of the ciliary rows in Nuda?
- A) They help in prey capture.
- B) They assist in digestion.
- C) They are used for swimming and locomotion.
- D) They serve as sensory structures.
Answer: C) They are used for swimming and locomotion.
- Which of the following is true about the reproduction of Nuda?
- A) They reproduce only asexually.
- B) They can exhibit both sexual and asexual reproduction.
- C) They reproduce through budding only.
- D) They reproduce exclusively through fragmentation.
Answer: B) They can exhibit both sexual and asexual reproduction.
- What environmental conditions are ideal for Nuda?
- A) High salinity and low temperatures
- B) Moderate salinity and warm temperatures
- C) Low oxygen levels
- D) Polluted waters
Answer: B) Moderate salinity and warm temperatures
- Which of the following is NOT a feature of Nuda?
- A) Presence of cilia
- B) Possession of tentacles
- C) Soft-bodied
- D) Gelatinous body
Answer: B) Possession of tentacles
- What is the primary feeding strategy of Nuda?
- A) Filter feeding
- B) Active predation
- C) Grazing on algae
- D) Scavenging
Answer: B) Active predation
- How do Nuda contribute to marine food webs?
- A) They are primary producers.
- B) They serve as prey for larger marine animals.
- C) They decompose organic matter.
- D) They compete with fish for food.
Answer: B) They serve as prey for larger marine animals.
- What kind of nervous system do Nuda possess?
- A) Centralized nervous system
- B) Diffuse nervous system
- C) No nervous system
- D) Complex brain structure
Answer: B) Diffuse nervous system
- Which of the following best describes the coloration of Nuda?
- A) Brightly colored for warning
- B) Camouflaged to blend in with surroundings
- C) Transparent or translucent
- D) Dark-colored for deep-water living
Answer: C) Transparent or translucent
- What is the role of mucus in the feeding of Nuda?
- A) It helps in digestion.
- B) It captures and holds onto prey.
- C) It protects against predators.
- D) It serves as a buoyancy aid.
Answer: B) It captures and holds onto prey.
- Which of the following adaptations helps Nuda evade predators?
- A) Camouflage
- B) Rapid swimming
- C) The ability to change color
- D) Bioluminescence
Answer: D) Bioluminescence
- What is the main ecological concern regarding Nuda populations?
- A) Overpopulation in their habitat
- B) Invasive species threatening them
- C) Climate change affecting their reproductive patterns
- D) Habitat destruction
Answer: C) Climate change affecting their reproductive patterns
- How does Nuda locomotion differ from that of other marine invertebrates?
- A) They swim using jet propulsion.
- B) They rely solely on current for movement.
- C) They utilize cilia for swimming.
- D) They crawl on the ocean floor.
Answer: C) They utilize cilia for swimming.
- What adaptation allows Nuda to thrive in open water?
- A) Ability to tolerate low oxygen levels
- B) Efficient swimming using cilia
- C) Ability to anchor to substrates
- D) Resistance to high salinity
Answer: B) Efficient swimming using cilia
- What are the major predators of Nuda in the marine ecosystem?
- A) Fish and large crustaceans
- B) Other ctenophores
- C) Sea turtles
- D) Marine mammals
Answer: A) Fish and large crustaceans
- What is the significance of bioluminescence in Nuda?
- A) It aids in reproduction.
- B) It attracts prey.
- C) It helps in communication.
- D) It serves as a defense mechanism.
Answer: D) It serves as a defense mechanism.