Sipunculidea MCQs

  • 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

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