- What is the primary habitat of Sipunculidea?
- A) Freshwater
- B) Marine
- C) Terrestrial
- D) Brackish water
Answer: B) Marine
- Which of the following best describes the body structure of Sipunculidea?
- A) Segmented
- B) Unsegmented
- C) Radially symmetrical
- D) Pseudocoelomate
Answer: B) Unsegmented
- What is the primary mode of locomotion in Sipunculidea?
- A) Crawling using legs
- B) Burrowing
- C) Swimming using fins
- D) Floating in water
Answer: B) Burrowing
- Sipunculidea are primarily classified as which type of organism?
- A) Mollusks
- B) Annelids
- C) Cnidarians
- D) Arthropods
Answer: B) Annelids
- What is the primary feeding strategy of Sipunculidea?
- A) Filter feeding
- B) Deposit feeding
- C) Predatory feeding
- D) Herbivorous feeding
Answer: B) Deposit feeding
- Which structure do Sipunculidea use for feeding?
- A) Tentacles
- B) Jaws
- C) Proboscis
- D) Gills
Answer: C) Proboscis
- How do Sipunculidea typically reproduce?
- A) Asexually through budding
- B) Sexually with external fertilization
- C) Asexually through fission
- D) Parthenogenetically
Answer: B) Sexually with external fertilization
- What is the main body cavity of Sipunculidea called?
- A) Coelom
- B) Hemocoel
- C) Pseudocoelom
- D) Gastrovascular cavity
Answer: C) Pseudocoelom
- Which of the following is a characteristic of Sipunculidea?
- A) They can retract their bodies into their shells.
- B) They possess a hard shell.
- C) They have well-developed eyes.
- D) They lack a nervous system.
Answer: A) They can retract their bodies into their shells.
- What is the function of the introvert in Sipunculidea?
- A) Locomotion
- B) Feeding
- C) Respiration
- D) Reproduction
Answer: B) Feeding
- Which of the following classes does Sipunculidea belong to?
- A) Polychaeta
- B) Sipuncula
- C) Oligochaeta
- D) Hirudinea
Answer: B) Sipuncula
- What is the typical length range of Sipunculidea species?
- A) 1-5 cm
- B) 5-30 cm
- C) 30-60 cm
- D) 60-100 cm
Answer: B) 5-30 cm
- What type of symmetry do Sipunculidea exhibit?
- A) Radial symmetry
- B) Bilateral symmetry
- C) Asymmetry
- D) Pentaradial symmetry
Answer: B) Bilateral symmetry
- Sipunculidea are often found in which of the following environments?
- A) High-altitude lakes
- B) Sandy or muddy substrates in the ocean
- C) Coral reefs
- D) Freshwater rivers
Answer: B) Sandy or muddy substrates in the ocean
- Which of the following is NOT a characteristic of Sipunculidea?
- A) Soft-bodied
- B) Lack of segmentation
- C) Presence of a hard exoskeleton
- D) Presence of a coelom
Answer: C) Presence of a hard exoskeleton
- Which of the following statements about Sipunculidea is true?
- A) They have a complex circulatory system.
- B) They have a simple nervous system.
- C) They are exclusively freshwater organisms.
- D) They exhibit complex reproductive strategies.
Answer: B) They have a simple nervous system.
- What is the primary ecological role of Sipunculidea?
- A) Primary producers
- B) Predators
- C) Decomposers
- D) Herbivores
Answer: C) Decomposers
- Which of the following features helps Sipunculidea in respiration?
- A) Body surface
- B) Gills
- C) Lungs
- D) Specialized breathing structures
Answer: A) Body surface
- How do Sipunculidea contribute to their ecosystem?
- A) By recycling nutrients
- B) By preying on larger organisms
- C) By forming symbiotic relationships
- D) By producing oxygen
Answer: A) By recycling nutrients
- What is the function of the cuticle in Sipunculidea?
- A) Locomotion
- B) Protection
- C) Respiration
- D) Digestion
Answer: B) Protection
- What type of digestive system do Sipunculidea possess?
- A) Incomplete digestive system
- B) Simple sac-like
- C) Complete digestive system
- D) No digestive system
Answer: C) Complete digestive system
- Which of the following structures is primarily involved in locomotion for Sipunculidea?
- A) Fins
- B) Muscular body contractions
- C) Cilia
- D) Legs
Answer: B) Muscular body contractions
- What kind of excretory system do Sipunculidea have?
- A) Malpighian tubules
- B) Protonephridia
- C) Coelomoducts
- D) Nephridia
Answer: B) Protonephridia
- Sipunculidea exhibit a form of development known as what?
- A) Direct development
- B) Indirect development with larval stages
- C) Asexual development
- D) Parthenogenetic development
Answer: B) Indirect development with larval stages
- Which structure is involved in the reproductive process of Sipunculidea?
- A) Gonads
- B) Gills
- C) Tentacles
- D) Body wall
Answer: A) Gonads
- Sipunculidea are known for their ability to do what?
- A) Swim freely
- B) Burrow into the substrate
- C) Form colonies
- D) Fly short distances
Answer: B) Burrow into the substrate
- What do Sipunculidea primarily feed on?
- A) Larger animals
- B) Organic matter and microorganisms
- C) Algae
- D) Detritus
Answer: B) Organic matter and microorganisms
- What is the significance of Sipunculidea in marine ecosystems?
- A) They help in sediment turnover.
- B) They are top predators.
- C) They are major primary producers.
- D) They serve no significant ecological role.
Answer: A) They help in sediment turnover.
- Which of the following is a common feature of Sipunculidea?
- A) Presence of a shell
- B) Soft-bodied
- C) Complex social behavior
- D) Photosynthetic capabilities
Answer: B) Soft-bodied
- What characteristic distinguishes Sipunculidea from other annelids?
- A) Presence of setae
- B) Lack of segmentation
- C) Presence of a hard exoskeleton
- D) Complex reproductive strategies
Answer: B) Lack of segmentation