- What is the common name for organisms in the phylum Ctenophora?
- A) Jellyfish
- B) Comb jellies
- C) Sea anemones
- D) Corals Answer: B) Comb jellies
- Which of the following structures is unique to ctenophores?
- A) Nematocysts
- B) Ctenes
- C) Tentacles
- D) Polyp Answer: B) Ctenes
- Ctenophores are primarily found in which type of habitat?
- A) Freshwater
- B) Marine environments
- C) Terrestrial
- D) All of the above Answer: B) Marine environments
- What type of symmetry do ctenophores exhibit?
- A) Bilateral symmetry
- B) Radial symmetry
- C) Asymmetry
- D) Pentaradial symmetry Answer: B) Radial symmetry
- Which of the following is a characteristic feature of ctenophores?
- A) Possession of a skeleton
- B) Bioluminescence
- C) Solid body structure
- D) No tentacles Answer: B) Bioluminescence
- What type of feeding strategy do ctenophores use?
- A) Filter feeding
- B) Predatory feeding
- C) Photosynthesis
- D) Parasitism Answer: B) Predatory feeding
- What is the primary means of locomotion in ctenophores?
- A) Jet propulsion
- B) Ciliary movement
- C) Swimming with appendages
- D) Crawl Answer: B) Ciliary movement
- Ctenophores can be distinguished from jellyfish by the presence of which structure?
- A) Medusa
- B) Cnidocytes
- C) Ctenes
- D) Tentacles Answer: C) Ctenes
- What is the function of the cilia on ctenophores?
- A) Sensory reception
- B) Locomotion
- C) Prey capture
- D) Reproduction Answer: B) Locomotion
- Which of the following statements about ctenophores is TRUE?
- A) They are primarily terrestrial.
- B) They possess stinging cells.
- C) They are mainly carnivorous.
- D) They lack a digestive system. Answer: C) They are mainly carnivorous.
- Which class includes the largest species of ctenophores?
- A) Tentaculata
- B) Nuda
- C) Cydippida
- D) Lobata Answer: B) Nuda
- What are the two main forms of ctenophores?
- A) Polyp and medusa
- B) Free-swimming and attached
- C) Cydippid and lobate
- D) Adult and larval Answer: C) Cydippid and lobate
- Ctenophores are known to have what type of reproductive strategy?
- A) Asexual reproduction only
- B) Sexual reproduction only
- C) Both asexual and sexual reproduction
- D) Budding only Answer: B) Sexual reproduction only
- What is the term used for the sticky cells used by ctenophores to capture prey?
- A) Cnidocytes
- B) Colloblasts
- C) Tentacles
- D) Ctenes Answer: B) Colloblasts
- Which of the following organisms is a common example of a ctenophore?
- A) Aurelia aurita (moon jelly)
- B) Pleurobrachia (sea gooseberry)
- C) Metridium (sea anemone)
- D) Acropora (coral) Answer: B) Pleurobrachia (sea gooseberry)
- What is the ecological role of ctenophores in marine ecosystems?
- A) Primary producers
- B) Predators of zooplankton
- C) Decomposers
- D) Herbivores Answer: B) Predators of zooplankton
- Ctenophores are most closely related to which of the following groups?
- A) Cnidarians
- B) Mollusks
- C) Echinoderms
- D) Flatworms Answer: A) Cnidarians
- Which of the following best describes the body structure of ctenophores?
- A) Composed of hard exoskeleton
- B) Soft-bodied and gelatinous
- C) Rigid and segmented
- D) Calcified Answer: B) Soft-bodied and gelatinous
- What kind of environmental conditions do ctenophores prefer?
- A) Cold, dark waters
- B) Warm, shallow waters
- C) Deep ocean trenches
- D) Polluted waters Answer: B) Warm, shallow waters
- Ctenophores can exhibit which type of coloration?
- A) Only brown
- B) Bright fluorescent colors
- C) Transparent only
- D) Black and white only Answer: B) Bright fluorescent colors
- The ability of ctenophores to glow in the dark is known as:
- A) Bioluminescence
- B) Phosphorescence
- C) Fluorescence
- D) Luminescence Answer: A) Bioluminescence
- Which of the following structures is NOT found in ctenophores?
- A) Tentacles
- B) Cilia
- C) Cnidocytes
- D) Colloblasts Answer: C) Cnidocytes
- Which ctenophore is known for its ability to swim backwards?
- A) Mnemiopsis leidyi
- B) Pleurobrachia
- C) Lobata
- D) Cydippida Answer: A) Mnemiopsis leidyi
- What is the primary component of the body of ctenophores?
- A) Chitin
- B) Gelatinous substance
- C) Calcium carbonate
- D) Silica Answer: B) Gelatinous substance
- How do ctenophores capture their prey?
- A) Using sharp beaks
- B) Using stinging cells
- C) Using sticky cells called colloblasts
- D) By engulfing them whole Answer: C) Using sticky cells called colloblasts
- What is the typical size range for ctenophores?
- A) 1 mm to 5 cm
- B) 5 cm to 50 cm
- C) 1 m to 2 m
- D) Varies widely, from mm to several meters Answer: D) Varies widely, from mm to several meters
- Which characteristic distinguishes the class Nuda within Ctenophora?
- A) Presence of long tentacles
- B) Absence of tentacles
- C) Presence of ctenes
- D) Ability to photosynthesize Answer: B) Absence of tentacles
- Ctenophores are primarily:
- A) Herbivores
- B) Carnivores
- C) Omnivores
- D) Detritivores Answer: B) Carnivores
- What is the main predator of ctenophores in the marine ecosystem?
- A) Sea turtles
- B) Larger fish
- C) Other ctenophores
- D) None of the above Answer: D) None of the above
- Which aspect of ctenophores makes them unique compared to other marine invertebrates?
- A) Their ability to produce venom
- B) Their lack of nervous systems
- C) Their use of cilia for swimming
- D) Their gelatinous body structure Answer: C) Their use of cilia for swimming