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- What is the common name for members of the class Ophiuroidea?
- A) Sea urchins
- B) Brittle stars
- C) Sea cucumbers
- D) Starfish
Answer: B) Brittle stars
- Which of the following best describes the body structure of Ophiuroidea?
- A) A central disc with long, slender arms
- B) A rigid shell with spines
- C) A soft, elongated body
- D) A star-shaped body with thick arms
Answer: A) A central disc with long, slender arms
- What is the primary mode of locomotion for Ophiuroidea?
- A) Swimming
- B) Crawling using their arms
- C) Jet propulsion
- D) Burrowing
Answer: B) Crawling using their arms
- How do Ophiuroidea typically feed?
- A) By filter feeding
- B) By scavenging and predation
- C) Through photosynthesis
- D) By absorbing nutrients from the water
Answer: B) By scavenging and predation
- What type of skeleton do Ophiuroidea have?
- A) Exoskeleton
- B) Endoskeleton
- C) Hydrostatic skeleton
- D) Cartilaginous skeleton
Answer: B) Endoskeleton
- What is the function of the madreporite in Ophiuroidea?
- A) It aids in digestion.
- B) It regulates water pressure in the water vascular system.
- C) It assists in reproduction.
- D) It serves as a sensory organ.
Answer: B) It regulates water pressure in the water vascular system.
- What do Ophiuroidea use for gas exchange?
- A) Gills
- B) Skin gills
- C) Specialized lungs
- D) Surface diffusion through the body wall
Answer: D) Surface diffusion through the body wall
- Which sensory structure is commonly found on Ophiuroidea?
- A) Eyespots
- B) Antennae
- C) Tentacles
- D) Sensory tube feet
Answer: A) Eyespots
- How do Ophiuroidea typically reproduce?
- A) Asexual budding
- B) Internal fertilization
- C) External fertilization
- D) Parthenogenesis
Answer: C) External fertilization
- Which of the following is a common habitat for Ophiuroidea?
- A) Freshwater
- B) Deep ocean floors
- C) Terrestrial environments
- D) Shallow coastal waters
Answer: D) Shallow coastal waters
- What is the role of tube feet in Ophiuroidea?
- A) Respiration
- B) Locomotion and feeding
- C) Digestion
- D) Sensory reception
Answer: B) Locomotion and feeding
- What is a notable defense mechanism of Ophiuroidea?
- A) Ejection of stomach contents
- B) Autotomy (self-amputation of arms)
- C) Camouflage
- D) Production of toxins
Answer: B) Autotomy (self-amputation of arms)
- Which type of symmetry do Ophiuroidea exhibit?
- A) Bilateral symmetry
- B) Radial symmetry
- C) Pentaradial symmetry
- D) Asymmetry
Answer: C) Pentaradial symmetry
- What type of circulatory system do Ophiuroidea have?
- A) Open circulatory system
- B) Closed circulatory system
- C) Water vascular system
- D) No circulatory system
Answer: C) Water vascular system
- Which of the following describes the feeding process of Ophiuroidea?
- A) They ingest food whole.
- B) They digest food externally before ingestion.
- C) They filter food from the water.
- D) They consume prey using their tube feet.
Answer: B) They digest food externally before ingestion.
- How do Ophiuroidea contribute to marine ecosystems?
- A) They act as primary producers.
- B) They help recycle nutrients in marine ecosystems.
- C) They are key predators in their environment.
- D) All of the above
Answer: B) They help recycle nutrients in marine ecosystems.
- What is the primary diet of most Ophiuroidea species?
- A) Algae
- B) Coral
- C) Detritus and small invertebrates
- D) Plankton
Answer: C) Detritus and small invertebrates
- Which Ophiuroidea species is known for its unique coloration?
- A) Basket star
- B) Brittle star
- C) Sea lily
- D) Crown-of-thorns starfish
Answer: A) Basket star
- What is a key characteristic of the arms of Ophiuroidea?
- A) They are fleshy and broad.
- B) They are slender and flexible.
- C) They are thick and muscular.
- D) They are short and rigid.
Answer: B) They are slender and flexible.
- How do Ophiuroidea typically escape predators?
- A) By swimming quickly
- B) By hiding in crevices
- C) By releasing toxins
- D) By regenerating lost arms
Answer: B) By hiding in crevices
- Which of the following describes the habitat range of Ophiuroidea?
- A) Only in shallow waters
- B) Only in deep ocean environments
- C) Found in a variety of marine habitats from shallow to deep waters
- D) Only in freshwater environments
Answer: C) Found in a variety of marine habitats from shallow to deep waters
- Which of the following adaptations do Ophiuroidea have for feeding?
- A) Long tube feet for grasping prey
- B) Specialized jaws
- C) A muscular stomach for grinding food
- D) Filter feeding structures
Answer: A) Long tube feet for grasping prey
- What is the ecological role of Ophiuroidea in the benthic community?
- A) They are primary producers.
- B) They are scavengers and predators, helping to control prey populations.
- C) They provide shelter for smaller organisms.
- D) They compete with fish for food resources.
Answer: B) They are scavengers and predators, helping to control prey populations.
- What is the typical lifespan of an Ophiuroidea?
- A) Less than one year
- B) 1 to 5 years
- C) 5 to 10 years
- D) Over 20 years
Answer: C) 5 to 10 years
- What environmental factors can affect the distribution of Ophiuroidea?
- A) Temperature
- B) Salinity
- C) Depth
- D) All of the above
Answer: D) All of the above
- What is the process called when Ophiuroidea lose an arm to escape a predator?
- A) Autotomy
- B) Regeneration
- C) Evisceration
- D) Fragmentation
Answer: A) Autotomy
- How do Ophiuroidea detect food in their environment?
- A) Using eyespots on their arms
- B) Through chemical cues in the water
- C) Using their tube feet
- D) All of the above
Answer: D) All of the above
- What type of feeders are Ophiuroidea classified as?
- A) Herbivores
- B) Carnivores
- C) Omnivores
- D) Detritivores
Answer: C) Omnivores
- Which of the following is a characteristic feature of Ophiuroidea?
- A) Thick, muscular arms
- B) A central disc with no distinct arms
- C) Highly branched arms
- D) Long, slender, and flexible arms
Answer: D) Long, slender, and flexible arms
- What is the significance of Ophiuroidea in marine food webs?
- A) They are primary producers.
- B) They serve as a food source for larger predators.
- C) They have no significant role.
- D) They are invasive species.
Answer: B) They serve as a food source for larger predators.