- What is the common name for members of the class Echinoidea?
- A) Sea urchins
- B) Jellyfish
- C) Sea cucumbers
- D) Brittle stars
Answer: A) Sea urchins
- Which feature is characteristic of Echinoidea?
- A) Soft-bodied with tentacles
- B) Hard, calcareous endoskeleton
- C) Radial symmetry
- D) Segmented body
Answer: B) Hard, calcareous endoskeleton
- What is the primary function of the tube feet in Echinoidea?
- A) Respiration
- B) Locomotion and feeding
- C) Defense
- D) Sensory reception
Answer: B) Locomotion and feeding
- Which of the following is a major group within Echinoidea?
- A) Starfish
- B) Sea cucumbers
- C) Sand dollars
- D) Basket stars
Answer: C) Sand dollars
- What type of diet do most Echinoidea exhibit?
- A) Herbivorous
- B) Carnivorous
- C) Detritivorous
- D) All of the above
Answer: D) All of the above
- How do Echinoidea typically reproduce?
- A) Asexual budding
- B) Internal fertilization
- C) External fertilization
- D) Parthenogenesis
Answer: C) External fertilization
- Which structure allows Echinoidea to feed on algae and small organisms?
- A) Aristotle’s lantern
- B) Tube feet
- C) Pedicellariae
- D) Madreporite
Answer: A) Aristotle’s lantern
- What is the main method of locomotion for Echinoidea?
- A) Swimming
- B) Crawling using tube feet
- C) Jet propulsion
- D) Gliding
Answer: B) Crawling using tube feet
- Which of the following is NOT a type of Echinoidea?
- A) Regular echinoids
- B) Irregular echinoids
- C) Crinoids
- D) Sand dollars
Answer: C) Crinoids
- What type of symmetry do Echinoidea exhibit?
- A) Bilateral symmetry
- B) Radial symmetry
- C) Asymmetry
- D) Pentaradial symmetry
Answer: B) Radial symmetry
- Which feature helps protect Echinoidea from predators?
- A) Coloration
- B) Spines on their body
- C) Ability to burrow
- D) Camouflage
Answer: B) Spines on their body
- What is the function of pedicellariae in Echinoidea?
- A) Feeding
- B) Locomotion
- C) Defense and cleaning
- D) Respiration
Answer: C) Defense and cleaning
- What environment do most Echinoidea inhabit?
- A) Freshwater
- B) Terrestrial
- C) Marine environments
- D) Estuaries
Answer: C) Marine environments
- What is a notable characteristic of irregular echinoids?
- A) They have a symmetrical body shape.
- B) They are typically more flattened and asymmetrical.
- C) They lack spines.
- D) They are always brightly colored.
Answer: B) They are typically more flattened and asymmetrical.
- What is the purpose of the madreporite in Echinoidea?
- A) It helps in locomotion.
- B) It regulates water entry into the water vascular system.
- C) It aids in digestion.
- D) It is used for respiration.
Answer: B) It regulates water entry into the water vascular system.
- Which type of echinoid is known for its ability to burrow into sand or mud?
- A) Sea urchin
- B) Sand dollar
- C) Heart urchin
- D) Regular echinoids
Answer: C) Heart urchin
- What role do Echinoidea play in their ecosystems?
- A) They are primary producers.
- B) They help control algal growth and recycle nutrients.
- C) They serve as keystone species.
- D) All of the above
Answer: B) They help control algal growth and recycle nutrients.
- What is the common defense mechanism employed by many Echinoidea?
- A) Mimicry
- B) Ejection of toxins
- C) Hard shells and spines
- D) Burrowing behavior
Answer: C) Hard shells and spines
- Which echinoid is known for its flat, disk-like shape and is often found on sandy bottoms?
- A) Regular urchin
- B) Sand dollar
- C) Sea biscuit
- D) Pencil urchin
Answer: B) Sand dollar
- What is the primary mode of feeding for most sea urchins?
- A) Suspension feeding
- B) Grazing on algae
- C) Filter feeding
- D) Predation on small fish
Answer: B) Grazing on algae
- How do sea urchins contribute to coral reef ecosystems?
- A) By eating coral
- B) By grazing on algae, preventing algal overgrowth
- C) By providing habitat for other species
- D) By increasing sedimentation
Answer: B) By grazing on algae, preventing algal overgrowth
- What is the primary means of reproduction for most Echinoidea?
- A) Budding
- B) External fertilization
- C) Internal fertilization
- D) Fragmentation
Answer: B) External fertilization
- Which of the following describes the shell of Echinoidea?
- A) Flexible and soft
- B) Hard and composed of fused plates
- C) Thin and transparent
- D) Composed of cartilaginous material
Answer: B) Hard and composed of fused plates
- What is the main advantage of having a calcareous shell in Echinoidea?
- A) Provides buoyancy
- B) Protects against predators
- C) Aids in locomotion
- D) Facilitates reproduction
Answer: B) Protects against predators
- What is the function of the lantern in sea urchins?
- A) Aids in respiration
- B) Used for feeding
- C) Provides buoyancy
- D) Helps in locomotion
Answer: B) Used for feeding
- How do Echinoidea typically respond to changes in their environment?
- A) They migrate to other areas.
- B) They adapt their feeding habits.
- C) They undergo metamorphosis.
- D) They exhibit behavioral changes like burrowing.
Answer: D) They exhibit behavioral changes like burrowing.
- Which of the following is an example of an irregular echinoid?
- A) Green sea urchin
- B) Sand dollar
- C) Long-spined urchin
- D) Pencil urchin
Answer: B) Sand dollar
- What adaptations help Echinoidea thrive in their marine habitats?
- A) Ability to produce toxins
- B) Hard shells and spines
- C) Ability to burrow
- D) All of the above
Answer: D) All of the above
- Which ecological role do Echinoidea fulfill in their environment?
- A) Primary consumers
- B) Secondary consumers
- C) Decomposers
- D) All of the above
Answer: A) Primary consumers
- What environmental factors influence the distribution of Echinoidea?
- A) Temperature
- B) Depth
- C) Availability of food
- D) All of the above
Answer: D) All of the above