- Sipuncula are commonly known as:
- A) Peanut worms
- B) Earthworms
- C) Ribbon worms
- D) Leeches
Answer: A) Peanut worms
- Sipunculans primarily inhabit:
- A) Freshwater environments
- B) Terrestrial habitats
- C) Marine environments
- D) Brackish water
Answer: C) Marine environments
- The body of a Sipunculan is divided into two main regions: the introvert and the:
- A) Abdomen
- B) Trunk
- C) Prostomium
- D) Segment
Answer: B) Trunk
- Which of the following is TRUE about Sipuncula?
- A) They possess a true coelom.
- B) They have a segmented body.
- C) They are completely aquatic.
- D) They have an exoskeleton.
Answer: A) They possess a true coelom.
- The feeding mechanism of Sipuncula involves:
- A) Gills
- B) Tentacles
- C) Cilia
- D) A radula
Answer: B) Tentacles
- Sipunculans primarily feed on:
- A) Phytoplankton
- B) Detritus
- C) Larger invertebrates
- D) Algae
Answer: B) Detritus
- The habitat of Sipuncula is primarily found in:
- A) Sand and mud substrates
- B) Coral reefs
- C) Rocky shores
- D) Open ocean
Answer: A) Sand and mud substrates
- The Sipunculan nervous system is:
- A) Highly developed
- B) Simple and decentralized
- C) Absent
- D) Only present in adults
Answer: B) Simple and decentralized
- The reproductive strategy of Sipuncula is primarily:
- A) Asexual
- B) Sexual
- C) Budding
- D) Fragmentation
Answer: B) Sexual
- The larvae of Sipuncula are known as:
- A) Trochophore larvae
- B) Veliger larvae
- C) Sipunculan larvae
- D) Echinoderm larvae
Answer: A) Trochophore larvae
- Which of the following statements is TRUE about Sipuncula?
- A) They have a well-defined head.
- B) They lack a segmented body.
- C) They are primarily freshwater animals.
- D) They have complex respiratory structures.
Answer: B) They lack a segmented body.
- Sipuncula belong to which larger taxonomic category?
- A) Phylum Annelida
- B) Phylum Mollusca
- C) Phylum Sipuncula
- D) Phylum Nematoda
Answer: C) Phylum Sipuncula
- The sipunculan’s body can retract into the trunk to avoid predators. This ability is known as:
- A) Burrowing
- B) Invagination
- C) Contraction
- D) Withdrawal
Answer: D) Withdrawal
- Which of the following is NOT a characteristic of Sipuncula?
- A) Lack of segmentation
- B) Presence of a coelom
- C) Well-developed circulatory system
- D) Presence of a radula
Answer: D) Presence of a radula
- Sipunculans are primarily:
- A) Herbivores
- B) Carnivores
- C) Detritivores
- D) Omnivores
Answer: C) Detritivores
- The coelom in Sipuncula is filled with:
- A) Blood
- B) Gel-like substance
- C) Body fluids
- D) Sea water
Answer: C) Body fluids
- The main mode of locomotion in Sipuncula is:
- A) Swimming
- B) Crawling
- C) Burrowing
- D) Floating
Answer: C) Burrowing
- Sipuncula have a body wall that consists of:
- A) A single layer of cells
- B) Two layers of muscles
- C) Chitinous segments
- D) A tough exoskeleton
Answer: B) Two layers of muscles
- In Sipuncula, respiration occurs primarily through:
- A) Gills
- B) Skin
- C) Specialized respiratory organs
- D) Pharyngeal slits
Answer: B) Skin
- The life cycle of Sipuncula includes a larval stage that typically develops in:
- A) Freshwater
- B) Marine environments
- C) Brackish water
- D) Terrestrial habitats
Answer: B) Marine environments
- Which of the following describes the body shape of most Sipuncula?
- A) Cylindrical
- B) Flat
- C) Elongated
- D) Spherical
Answer: A) Cylindrical
- Which of the following is a common genus of Sipuncula?
- A) Sipunculus
- B) Lumbricus
- C) Nereis
- D) Aplysia
Answer: A) Sipunculus
- The body cavity of Sipuncula is derived from:
- A) Schizocoely
- B) Enterocoely
- C) Coelomate
- D) Pseudocoelom
Answer: A) Schizocoely
- Which statement about Sipunculan reproduction is FALSE?
- A) They can reproduce through fragmentation.
- B) Most are dioecious.
- C) They can produce both eggs and sperm.
- D) They are all hermaphroditic.
Answer: D) They are all hermaphroditic.
- Sipunculans are known for their ability to:
- A) Change colors rapidly
- B) Produce bioluminescence
- C) Regenerate lost body parts
- D) Live at extreme depths
Answer: C) Regenerate lost body parts
- Which of the following ecological roles do Sipuncula primarily serve?
- A) Primary producers
- B) Detritivores
- C) Predators
- D) Symbionts
Answer: B) Detritivores
- Sipuncula exhibit which type of symmetry?
- A) Bilateral symmetry
- B) Radial symmetry
- C) Asymmetry
- D) None of the above
Answer: A) Bilateral symmetry
- What is the main purpose of the introvert in Sipuncula?
- A) Locomotion
- B) Feeding
- C) Respiration
- D) Protection
Answer: B) Feeding
- Sipunculans are closely related to which group of animals?
- A) Annelids
- B) Mollusks
- C) Echinoderms
- D) Cnidarians
Answer: A) Annelids
- In Sipuncula, the anal opening is located at the:
- A) Anterior end
- B) Middle of the body
- C) Posterior end
- D) Ventral side
Answer: C) Posterior end