- 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