- What is the common name for members of the class Asteroidea?
- A) Sea urchins
- B) Sea cucumbers
- C) Starfish
- D) Feather stars
Answer: C) Starfish
- What type of symmetry do adult Asteroidea exhibit?
- A) Bilateral symmetry
- B) Radial symmetry
- C) Asymmetry
- D) Pentaradial symmetry
Answer: D) Pentaradial symmetry
- What is the primary function of the tube feet in Asteroidea?
- A) Respiration
- B) Locomotion and feeding
- C) Digestion
- D) Reproduction
Answer: B) Locomotion and feeding
- How do Asteroidea typically feed?
- A) Through photosynthesis
- B) Filter feeding
- C) Predation, by eviscerating prey
- D) Absorbing nutrients through their skin
Answer: C) Predation, by eviscerating prey
- Which of the following is a characteristic feature of Asteroidea?
- A) A hard shell
- B) Tentacles
- C) A central disc and radiating arms
- D) A segmented body
Answer: C) A central disc and radiating arms
- What is the main habitat of Asteroidea?
- A) Freshwater
- B) Terrestrial
- C) Marine environments
- D) Brackish water
Answer: C) Marine environments
- Which structure do Asteroidea use for gas exchange?
- A) Gills
- B) Lungs
- C) Skin gills
- D) Book lungs
Answer: C) Skin gills
- How do Asteroidea reproduce?
- A) Asexual reproduction only
- B) Sexual reproduction only
- C) Both asexual and sexual reproduction
- D) Budding only
Answer: B) Sexual reproduction only
- What type of skeleton do Asteroidea possess?
- A) Exoskeleton
- B) Endoskeleton
- C) Hydrostatic skeleton
- D) Cartilaginous skeleton
Answer: B) Endoskeleton
- Which of the following is a common predator of Asteroidea?
- A) Fish
- B) Sea turtles
- C) Crustaceans
- D) Larger starfish
Answer: B) Sea turtles
- What is the role of the madreporite in Asteroidea?
- A) It aids in feeding.
- B) It helps in respiration.
- C) It regulates water pressure in the water vascular system.
- D) It serves as a reproductive organ.
Answer: C) It regulates water pressure in the water vascular system.
- Which of the following is a defense mechanism of Asteroidea?
- A) Bioluminescence
- B) Ejection of stomach contents
- C) Production of toxins
- D) Camouflage
Answer: B) Ejection of stomach contents
- How many arms do most Asteroidea typically have?
- A) Four
- B) Five
- C) Six
- D) Eight
Answer: B) Five
- What is the purpose of the tube feet’s suction ability in Asteroidea?
- A) To capture prey
- B) To anchor to surfaces
- C) To help in respiration
- D) Both A and B
Answer: D) Both A and B
- Which sensory structure is commonly found on the tips of Asteroidea’s arms?
- A) Eyespots
- B) Antennae
- C) Chemoreceptors
- D) Tentacles
Answer: A) Eyespots
- What is the main diet of most Asteroidea species?
- A) Algae
- B) Coral
- C) Bivalves and other invertebrates
- D) Plankton
Answer: C) Bivalves and other invertebrates
- What do Asteroidea use to regenerate lost arms?
- A) Stem cells
- B) Hormones
- C) Specialized regeneration cells
- D) Tissue differentiation
Answer: C) Specialized regeneration cells
- How do Asteroidea contribute to marine ecosystems?
- A) By preying on bivalves, they help control their populations.
- B) By being a primary producer
- C) By competing with fish for food
- D) By serving as a food source for other predators
Answer: A) By preying on bivalves, they help control their populations.
- Which Asteroidea species is known for its ability to consume coral?
- A) Crown-of-thorns starfish
- B) Sunflower starfish
- C) Blue starfish
- D) Chocolate chip starfish
Answer: A) Crown-of-thorns starfish
- What kind of locomotion do Asteroidea primarily use?
- A) Swimming
- B) Crawling
- C) Burrowing
- D) Flying
Answer: B) Crawling
- How do Asteroidea typically detect their environment?
- A) Through smell
- B) Through touch and light-sensitive cells
- C) Through taste
- D) Through sight
Answer: B) Through touch and light-sensitive cells
- What is the common reproductive strategy of Asteroidea?
- A) External fertilization
- B) Internal fertilization
- C) Asexual budding
- D) Parthenogenesis
Answer: A) External fertilization
- Which of the following describes the feeding process of Asteroidea?
- A) They digest food externally before ingestion.
- B) They consume prey whole without digestion.
- C) They have specialized jaws to chew food.
- D) They absorb nutrients directly through their skin.
Answer: A) They digest food externally before ingestion.
- What is the ecological significance of Asteroidea?
- A) They provide habitat for smaller organisms.
- B) They help recycle nutrients in marine ecosystems.
- C) They are key predators in their environment.
- D) All of the above
Answer: D) All of the above
- How do Asteroidea respond to threats in their environment?
- A) By swimming away
- B) By hiding in crevices
- C) By expelling toxins
- D) By releasing camouflage
Answer: B) By hiding in crevices
- What type of circulatory system do Asteroidea 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 Asteroidea species is known for its vibrant colors?
- A) Crown-of-thorns starfish
- B) Green sea star
- C) Blue starfish
- D) All of the above
Answer: D) All of the above
- What is a key characteristic of the water vascular system in Asteroidea?
- A) It circulates blood.
- B) It aids in movement and feeding.
- C) It is used for reproduction.
- D) It helps with gas exchange.
Answer: B) It aids in movement and feeding.
- What role do Asteroidea play in coral reef ecosystems?
- A) They act as herbivores.
- B) They help maintain balance by preying on coral competitors.
- C) They provide shelter for other marine life.
- D) They are apex predators.
Answer: B) They help maintain balance by preying on coral competitors.
- Which class of echinoderms does Asteroidea belong to?
- A) Crinoidea
- B) Echinoidea
- C) Ophiuroidea
- D) Echinodermata
Answer: D) Echinodermata