- Mollusca is a phylum that includes which of the following organisms?
- A) Insects
- B) Worms
- C) Snails and clams
- D) Fish Answer: C) Snails and clams
- The soft body of mollusks is typically divided into how many main parts?
- A) Two
- B) Three
- C) Four
- D) Five Answer: B) Three
- Which structure is unique to mollusks and used for feeding?
- A) Radula
- B) Tentacle
- C) Siphon
- D) Gills Answer: A) Radula
- Mollusks are primarily classified into how many major classes?
- A) Two
- B) Three
- C) Four
- D) Eight Answer: C) Four
- Which class of mollusks includes the octopus and squid?
- A) Bivalvia
- B) Gastropoda
- C) Cephalopoda
- D) Polyplacophora Answer: C) Cephalopoda
- Bivalves are characterized by having:
- A) A single shell
- B) No shell
- C) Two shells
- D) A segmented body Answer: C) Two shells
- Which of the following is NOT a characteristic of mollusks?
- A) Coelomate body plan
- B) Segmented body
- C) Presence of a mantle
- D) Possession of a foot Answer: B) Segmented body
- What is the primary function of the mantle in mollusks?
- A) Locomotion
- B) Respiration
- C) Protection and shell secretion
- D) Digestion Answer: C) Protection and shell secretion
- The largest class of mollusks is:
- A) Cephalopoda
- B) Bivalvia
- C) Gastropoda
- D) Polyplacophora Answer: C) Gastropoda
- Which of the following mollusks is known for its ability to change color?
- A) Clam
- B) Snail
- C) Octopus
- D) Oyster Answer: C) Octopus
- How do most bivalves obtain their food?
- A) Hunting
- B) Filter feeding
- C) Grazing
- D) Parasitism Answer: B) Filter feeding
- The siphon in mollusks is primarily used for:
- A) Locomotion
- B) Excretion
- C) Respiration and feeding
- D) Reproduction Answer: C) Respiration and feeding
- Which mollusk is commonly known for its spiral shell?
- A) Squid
- B) Clam
- C) Nautilus
- D) Octopus Answer: C) Nautilus
- Mollusks reproduce primarily through:
- A) Asexual reproduction
- B) Sexual reproduction
- C) Budding
- D) Fragmentation Answer: B) Sexual reproduction
- Which of the following is a characteristic of cephalopods?
- A) They are typically sessile.
- B) They have a reduced or absent shell.
- C) They possess a foot used for burrowing.
- D) They have gills for respiration. Answer: B) They have a reduced or absent shell.
- Which mollusk is known for producing pearls?
- A) Snail
- B) Squid
- C) Oyster
- D) Cuttlefish Answer: C) Oyster
- The foot of a mollusk is primarily used for:
- A) Feeding
- B) Locomotion
- C) Respiration
- D) Reproduction Answer: B) Locomotion
- What type of circulatory system do most mollusks have?
- A) Open circulatory system
- B) Closed circulatory system
- C) Simple diffusion
- D) Hemolymph system Answer: A) Open circulatory system
- Which class of mollusks includes organisms with a shell divided into eight plates?
- A) Gastropoda
- B) Bivalvia
- C) Polyplacophora
- D) Cephalopoda Answer: C) Polyplacophora
- Which of the following statements is true about gastropods?
- A) They have two shells.
- B) They are exclusively marine.
- C) They exhibit torsion during development.
- D) They lack a foot. Answer: C) They exhibit torsion during development.
- Which of the following mollusks is known for its advanced nervous system?
- A) Clam
- B) Squid
- C) Snail
- D) Chiton Answer: B) Squid
- What type of habitat do most mollusks occupy?
- A) Terrestrial
- B) Aquatic
- C) Both terrestrial and aquatic
- D) Only marine Answer: C) Both terrestrial and aquatic
- Mollusks have a unique excretory structure called:
- A) Nephridia
- B) Kidneys
- C) Gills
- D) Mantle Answer: A) Nephridia
- The main component of a mollusk’s shell is:
- A) Chitin
- B) Calcium carbonate
- C) Keratin
- D) Silica Answer: B) Calcium carbonate
- Mollusks are known to exhibit a variety of:
- A) Body plans
- B) Respiratory systems
- C) Feeding strategies
- D) All of the above Answer: D) All of the above
- Which of the following is a common characteristic of all mollusks?
- A) Presence of segmented body
- B) Mantle and shell
- C) Presence of antennae
- D) Ability to fly Answer: B) Mantle and shell
- The term “torsion” in gastropods refers to:
- A) The coiling of the shell
- B) The twisting of the body during development
- C) The process of feeding
- D) The method of locomotion Answer: B) The twisting of the body during development
- What type of diet do most carnivorous mollusks have?
- A) Herbivorous
- B) Detritivorous
- C) Planktivorous
- D) Predatory Answer: D) Predatory
- Which of the following structures is used by mollusks for respiration?
- A) Lungs
- B) Gills
- C) Skin
- D) Mantle Answer: B) Gills
- The primary ecological role of mollusks is:
- A) Primary producers
- B) Decomposers
- C) Herbivores and predators
- D) None of the above Answer: C) Herbivores and predators