- Priapulida are commonly known as:
- A) Horsehair worms
- B) Penis worms
- C) Ribbon worms
- D) Roundworms
Answer: B) Penis worms
- The body structure of Priapulida is primarily characterized by:
- A) Segmentation
- B) A muscular proboscis
- C) Tentacles
- D) A rigid exoskeleton
Answer: B) A muscular proboscis
- Priapulids are primarily found in which habitat?
- A) Freshwater
- B) Terrestrial
- C) Marine environments
- D) All of the above
Answer: C) Marine environments
- The main function of the proboscis in Priapulida is to:
- A) Capture prey
- B) Reproduce
- C) Regulate water flow
- D) Absorb nutrients
Answer: A) Capture prey
- Which of the following is a defining feature of Priapulida?
- A) Jointed appendages
- B) A closed circulatory system
- C) A coelomate body structure
- D) Lack of true segmentation
Answer: D) Lack of true segmentation
- Priapulids are primarily:
- A) Herbivores
- B) Detritivores
- C) Carnivores
- D) Omnivores
Answer: C) Carnivores
- The body of a Priapulid can be divided into which two main regions?
- A) Head and trunk
- B) Proboscis and tail
- C) Anterior and posterior
- D) Thorax and abdomen
Answer: A) Head and trunk
- Priapulids have a body covering made of:
- A) Chitin
- B) Calcium carbonate
- C) Cuticle
- D) Sclerotized plates
Answer: C) Cuticle
- The larval stage of Priapulida is called:
- A) Trochophore
- B) Veliger
- C) Nauplius
- D) Priapulus
Answer: A) Trochophore
- Which of the following statements about Priapulida is TRUE?
- A) They have a complex nervous system.
- B) They exhibit bilateral symmetry.
- C) They are a type of annelid.
- D) They lack a digestive system.
Answer: B) They exhibit bilateral symmetry.
- Which structure in Priapulida is primarily responsible for locomotion?
- A) Proboscis
- B) Coelom
- C) Body muscles
- D) Tentacles
Answer: C) Body muscles
- Priapulida are known to inhabit:
- A) Sandy and muddy substrates
- B) Rocky shorelines
- C) Open ocean
- D) Coral reefs
Answer: A) Sandy and muddy substrates
- Which of the following organisms are closely related to Priapulida?
- A) Mollusks
- B) Arthropods
- C) Annelids
- D) Echinoderms
Answer: C) Annelids
- The main reproductive strategy of Priapulida is:
- A) Asexual reproduction
- B) External fertilization
- C) Internal fertilization
- D) Budding
Answer: B) External fertilization
- Priapulids primarily feed on:
- A) Phytoplankton
- B) Small invertebrates
- C) Bacteria
- D) Plant material
Answer: B) Small invertebrates
- The term “Priapulida” is derived from:
- A) Latin for “pencil worm”
- B) Latin for “penis worm”
- C) Greek for “priapus”
- D) Greek for “water creature”
Answer: B) Latin for “penis worm”
- The cuticle of Priapulida serves which primary purpose?
- A) Protection against predators
- B) Absorption of nutrients
- C) Regulation of gas exchange
- D) Maintaining buoyancy
Answer: A) Protection against predators
- In terms of size, Priapulids are typically:
- A) Microscopic
- B) Small (a few centimeters)
- C) Medium-sized (up to 20 cm)
- D) Large (over 1 meter)
Answer: C) Medium-sized (up to 20 cm)
- Which type of symmetry do Priapulida exhibit?
- A) Radial symmetry
- B) Bilateral symmetry
- C) Asymmetry
- D) None of the above
Answer: B) Bilateral symmetry
- What is the primary role of Priapulida in their ecosystem?
- A) Primary producers
- B) Detritivores and predators
- C) Parasitic organisms
- D) Symbiotic organisms
Answer: B) Detritivores and predators
- The most recognized species of Priapulida is:
- A) Priapulus caudatus
- B) Priapulus fish
- C) Priapulus longus
- D) Priapulus aquaticus
Answer: A) Priapulus caudatus
- Priapulids are classified under which phylum?
- A) Mollusca
- B) Annelida
- C) Arthropoda
- D) Priapulida
Answer: D) Priapulida
- Which of the following is NOT a feature of Priapulida?
- A) A coelom
- B) True segmentation
- C) A proboscis
- D) A cuticle
Answer: B) True segmentation
- The habitat of Priapulida mainly consists of:
- A) Coral reefs
- B) Deep-sea trenches
- C) Intertidal zones
- D) Subtidal sediments
Answer: D) Subtidal sediments
- Priapulids can be classified as:
- A) Marine invertebrates
- B) Freshwater invertebrates
- C) Terrestrial organisms
- D) Aquatic vertebrates
Answer: A) Marine invertebrates
- Which of the following is a significant threat to Priapulida populations?
- A) Habitat destruction
- B) Overfishing
- C) Climate change
- D) All of the above
Answer: D) All of the above
- What type of circulatory system do Priapulida possess?
- A) Open circulatory system
- B) Closed circulatory system
- C) No circulatory system
- D) Lymphatic system
Answer: C) No circulatory system
- The digestive system of Priapulida is classified as:
- A) Complete
- B) Incomplete
- C) Absent
- D) None of the above
Answer: A) Complete
- In Priapulida, gas exchange primarily occurs through:
- A) Gills
- B) Skin
- C) Respiratory structures
- D) Mouth
Answer: B) Skin
- The evolutionary significance of Priapulida lies in their:
- A) Unique body structure
- B) Primitive traits
- C) Ecological role as predators
- D) All of the above
Answer: D) All of the above