Phylum Porifera MCQs

  • Porifera are commonly known as:
    • A) Sponges
    • B) Corals
    • C) Sea anemones
    • D) Jellyfish
      Answer: A) Sponges
  • Which of the following is a characteristic feature of Porifera?
    • A) Body symmetry
    • B) Presence of true tissues
    • C) Multicellular but lack true tissues
    • D) Possession of a digestive system
      Answer: C) Multicellular but lack true tissues
  • The body of a sponge is supported by:
    • A) Hydrostatic skeleton
    • B) Exoskeleton
    • C) Spicules and spongin
    • D) Cartilage
      Answer: C) Spicules and spongin
  • The main function of choanocytes in Porifera is to:
    • A) Reproduce
    • B) Filter food particles
    • C) Provide structural support
    • D) Regulate water flow
      Answer: B) Filter food particles
  • Which of the following structures is responsible for water flow in sponges?
    • A) Osculum
    • B) Porocyte
    • C) Choanocyte
    • D) Spicule
      Answer: B) Porocyte
  • Sponges are primarily found in which type of environment?
    • A) Terrestrial
    • B) Freshwater
    • C) Marine
    • D) Both B and C
      Answer: D) Both B and C
  • The simplest body form of sponges is known as:
    • A) Asconoid
    • B) Syconoid
    • C) Leuconoid
    • D) Polyconoid
      Answer: A) Asconoid
  • The process by which sponges reproduce asexually is called:
    • A) Budding
    • B) Fission
    • C) Fragmentation
    • D) All of the above
      Answer: D) All of the above
  • Which of the following is NOT a function of sponges?
    • A) Filtration of water
    • B) Photosynthesis
    • C) Providing habitat for other organisms
    • D) Reproduction
      Answer: B) Photosynthesis
  • The skeletal structure of Porifera is composed of:
    • A) Calcium carbonate
    • B) Silica
    • C) Spongin fibers
    • D) All of the above
      Answer: D) All of the above
  • Which of the following types of sponges has a complex body structure?
    • A) Asconoid
    • B) Syconoid
    • C) Leuconoid
    • D) All of the above
      Answer: C) Leuconoid
  • The large opening at the top of a sponge through which water exits is called the:
    • A) Osculum
    • B) Incurrent canal
    • C) Spongocoel
    • D) Porocyte
      Answer: A) Osculum
  • Which cells in sponges are responsible for producing sperm and eggs?
    • A) Pinacocytes
    • B) Choanocytes
    • C) Archaeocytes
    • D) Myocytes
      Answer: C) Archaeocytes
  • What is the primary mode of nutrition for sponges?
    • A) Photosynthesis
    • B) Heterotrophy
    • C) Chemosynthesis
    • D) Parasitism
      Answer: B) Heterotrophy
  • In sponges, the term “asexual reproduction” refers to:
    • A) Fusion of gametes
    • B) Budding and fragmentation
    • C) Development of larvae
    • D) All of the above
      Answer: B) Budding and fragmentation
  • The larval form of sponges is typically:
    • A) Free-swimming
    • B) Sessile
    • C) Parasitic
    • D) Non-motile
      Answer: A) Free-swimming
  • The term “filter feeder” refers to organisms that:
    • A) Consume whole prey
    • B) Filter food particles from water
    • C) Absorb nutrients through their skin
    • D) Prey on other animals
      Answer: B) Filter food particles from water
  • The color of sponges is often due to:
    • A) The presence of pigments
    • B) The type of water they inhabit
    • C) The age of the sponge
    • D) All of the above
      Answer: A) The presence of pigments
  • Which of the following statements about Porifera is TRUE?
    • A) They have complex nervous systems.
    • B) They are capable of regeneration.
    • C) They have a true coelom.
    • D) They can only reproduce sexually.
      Answer: B) They are capable of regeneration.
  • The main function of the spongocoel is to:
    • A) Store nutrients
    • B) Regulate water flow
    • C) Serve as a central cavity for water circulation
    • D) Provide support
      Answer: C) Serve as a central cavity for water circulation
  • Which type of sponge is most commonly found in marine environments?
    • A) Freshwater sponges
    • B) Terrestrial sponges
    • C) Marine sponges
    • D) All of the above
      Answer: C) Marine sponges
  • Porifera are primarily characterized by which type of symmetry?
    • A) Bilateral symmetry
    • B) Radial symmetry
    • C) Asymmetry
    • D) None of the above
      Answer: C) Asymmetry
  • The classification of sponges into different classes is based on:
    • A) Their reproductive methods
    • B) Their skeletal structure
    • C) Their feeding habits
    • D) Their habitat
      Answer: B) Their skeletal structure
  • Sponges primarily use which method for gas exchange?
    • A) Diffusion
    • B) Gills
    • C) Lungs
    • D) Surface area
      Answer: A) Diffusion
  • Which of the following groups does NOT include sponges?
    • A) Calcarea
    • B) Hexactinellida
    • C) Demospongiae
    • D) Cnidaria
      Answer: D) Cnidaria
  • The ability of sponges to filter large volumes of water is primarily due to:
    • A) Their large size
    • B) The presence of choanocytes
    • C) Their complex body structures
    • D) All of the above
      Answer: B) The presence of choanocytes
  • Which of the following describes the lifestyle of most sponges?
    • A) Free-living
    • B) Parasitic
    • C) Sessile
    • D) Mobile
      Answer: C) Sessile
  • Which type of spicule is characteristic of the class Hexactinellida?
    • A) Siliceous
    • B) Calcareous
    • C) Organic
    • D) None of the above
      Answer: A) Siliceous
  • The mesohyl in sponges functions primarily as:
    • A) A digestive cavity
    • B) A structural support layer
    • C) A site for reproduction
    • D) A site for waste storage
      Answer: B) A structural support layer
  • Which of the following is a common ecological role of sponges?
    • A) Competing with fish for food
    • B) Providing habitat for marine organisms
    • C) Acting as parasites
    • D) Contributing to coral reef growth
      Answer: B) Providing habitat for marine organisms

 

Classes of Porifera

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