- What is the primary characteristic of the class Scyphozoa?
- A) They have a complex nervous system.
- B) They primarily exist in the medusa form.
- C) They are exclusively freshwater species.
- D) They have a hardened exoskeleton.
Answer: B) They primarily exist in the medusa form.
- Which of the following is a well-known example of a Scyphozoan?
- A) Hydra
- B) Moon jellyfish (Aurelia aurita)
- C) Portuguese man o’ war
- D) Sea anemone
Answer: B) Moon jellyfish (Aurelia aurita)
- What is the dominant life stage of Scyphozoans?
- A) Polyp
- B) Planula
- C) Medusa
- D) Larval
Answer: C) Medusa
- What structure is responsible for the propulsion of Scyphozoans in water?
- A) Tentacles
- B) Bell
- C) Mesoglea
- D) Gastrovascular cavity
Answer: B) Bell
- What type of symmetry is characteristic of Scyphozoans?
- A) Bilateral symmetry
- B) Asymmetry
- C) Radial symmetry
- D) Pentaradial symmetry
Answer: C) Radial symmetry
- Which of the following is a method of reproduction in Scyphozoans?
- A) Asexual reproduction only
- B) Budding
- C) Sexual reproduction
- D) Fragmentation
Answer: C) Sexual reproduction
- What type of feeding strategy do Scyphozoans primarily use?
- A) Filter feeding
- B) Predatory feeding
- C) Herbivorous feeding
- D) Parasitic feeding
Answer: B) Predatory feeding
- Which cell type is responsible for stinging in Scyphozoans?
- A) Muscle cells
- B) Epithelial cells
- C) Cnidocytes
- D) Neurons
Answer: C) Cnidocytes
- What is the primary role of the tentacles in Scyphozoans?
- A) Locomotion
- B) Sensation
- C) Capturing prey
- D) Reproduction
Answer: C) Capturing prey
- Which of the following best describes the mesoglea in Scyphozoans?
- A) A solid structure
- B) A gelatinous substance
- C) A muscular layer
- D) A nerve net
Answer: B) A gelatinous substance
- Which structure in Scyphozoans aids in buoyancy?
- A) Bell
- B) Tentacles
- C) Gastrovascular cavity
- D) Mesoglea
Answer: D) Mesoglea
- What is the ecological role of Scyphozoans in marine ecosystems?
- A) Primary producers
- B) Predators
- C) Decomposers
- D) Herbivores
Answer: B) Predators
- What is the term for the larval stage of Scyphozoans?
- A) Polyp
- B) Medusa
- C) Planula
- D) Ephyra
Answer: C) Planula
- Which of the following is a potential predator of Scyphozoans?
- A) Sea turtles
- B) Sea urchins
- C) Crabs
- D) Fish
Answer: A) Sea turtles
- What can cause a bloom of Scyphozoans in marine environments?
- A) Increased nutrients
- B) Overfishing
- C) Climate change
- D) All of the above
Answer: D) All of the above
- Which Scyphozoan is known for its large size and long tentacles?
- A) Moon jellyfish
- B) Lion’s mane jellyfish
- C) Box jellyfish
- D) Aurelia aurita
Answer: B) Lion’s mane jellyfish
- What is the primary function of the gastrovascular cavity in Scyphozoans?
- A) Movement
- B) Digestion and circulation
- C) Sensory perception
- D) Respiration
Answer: B) Digestion and circulation
- What environmental condition can significantly impact the life cycle of Scyphozoans?
- A) Temperature
- B) Salinity
- C) Oxygen levels
- D) All of the above
Answer: D) All of the above
- Which Scyphozoan is often studied for its bioluminescent properties?
- A) Aurelia aurita
- B) Cyanea capillata
- C) Chironex fleckeri
- D) Cassiopeia
Answer: B) Cyanea capillata
- How do Scyphozoans typically respond to environmental stimuli?
- A) Through complex behaviors
- B) With simple reflex actions
- C) They do not respond
- D) By changing color
Answer: B) With simple reflex actions
- What distinguishes Scyphozoans from Hydrozoans?
- A) Presence of a polyp stage
- B) Dominance of the medusa stage
- C) Habitat
- D) Size
Answer: B) Dominance of the medusa stage
- What is the typical diet of Scyphozoans?
- A) Algae
- B) Zooplankton and small fish
- C) Detritus
- D) Bacteria
Answer: B) Zooplankton and small fish
- In which of the following habitats are Scyphozoans commonly found?
- A) Freshwater lakes
- B) Coral reefs
- C) Open ocean
- D) All of the above
Answer: C) Open ocean
- Which of the following is a reproductive strategy used by Scyphozoans?
- A) Parthenogenesis
- B) Budding
- C) Sexual reproduction
- D) Asexual reproduction only
Answer: C) Sexual reproduction
- What is the main threat to Scyphozoan populations?
- A) Habitat destruction
- B) Overfishing
- C) Climate change
- D) All of the above
Answer: D) All of the above
- Which part of the Scyphozoan is primarily responsible for sensing the environment?
- A) Tentacles
- B) Bell
- C) Gastrovascular cavity
- D) Mesoglea
Answer: A) Tentacles
- Which of the following is a characteristic feature of the lion’s mane jellyfish?
- A) Bright colors
- B) Long tentacles
- C) Small size
- D) Freshwater habitat
Answer: B) Long tentacles
- What kind of ecological impacts can occur due to Scyphoan blooms?
- A) Disruption of food webs
- B) Decrease in fish populations
- C) Economic impacts on fisheries
- D) All of the above
Answer: D) All of the above
- Which structure in the Scyphozoan life cycle develops from the planula?
- A) Medusa
- B) Ephyra
- C) Polyp
- D) Larva
Answer: C) Polyp
- What is the role of the oral arms in Scyphozoans?
- A) Propulsion
- B) Feeding
- C) Sensation
- D) Locomotion
Answer: B) Feeding