- What is the primary feature that distinguishes bivalves from other mollusks?
- A) Presence of a shell
- B) Two-part shell (valves)
- C) Radula
- D) Tentacles
Answer: B) Two-part shell (valves)
- Which of the following is a common habitat for bivalves?
- A) Marine environments
- B) Freshwater lakes
- C) Estuaries
- D) All of the above
Answer: D) All of the above
- Bivalves primarily feed through which mechanism?
- A) Filter feeding
- B) Grazing
- C) Predation
- D) Parasitism
Answer: A) Filter feeding
- The two shells of a bivalve are connected by a structure called:
- A) Hinge
- B) Ligament
- C) Adductor muscle
- D) Mantle
Answer: A) Hinge
- Which bivalve is commonly known for producing pearls?
- A) Clam
- B) Oyster
- C) Scallop
- D) Mussel
Answer: B) Oyster
- The main method of locomotion in bivalves is:
- A) Swimming
- B) Crawling
- C) Burrowing
- D) Jet propulsion
Answer: C) Burrowing
- Which part of the bivalve is responsible for secreting the shell?
- A) Mantle
- B) Foot
- C) Gills
- D) Visceral mass
Answer: A) Mantle
- What type of circulatory system do bivalves have?
- A) Open circulatory system
- B) Closed circulatory system
- C) No circulatory system
- D) Simple diffusion
Answer: A) Open circulatory system
- Which of the following is NOT a typical feature of bivalves?
- A) Two shells
- B) Tentacles
- C) Gills
- D) Foot
Answer: B) Tentacles
- Bivalves are primarily:
- A) Herbivores
- B) Carnivores
- C) Omnivores
- D) Detritivores
Answer: C) Omnivores
- What is the role of the siphons in bivalves?
- A) Movement
- B) Feeding and respiration
- C) Reproduction
- D) Protection
Answer: B) Feeding and respiration
- Which of the following bivalves is known for its ability to swim?
- A) Clam
- B) Oyster
- C) Scallop
- D) Mussel
Answer: C) Scallop
- Which structure in bivalves helps in respiration?
- A) Gills
- B) Foot
- C) Mantle cavity
- D) Siphons
Answer: A) Gills
- What is the primary method of reproduction in most bivalves?
- A) Asexual reproduction
- B) Sexual reproduction
- C) Budding
- D) Fragmentation
Answer: B) Sexual reproduction
- Bivalves can be found in which of the following types of environments?
- A) Intertidal zones
- B) Deep ocean
- C) Freshwater rivers
- D) All of the above
Answer: D) All of the above
- Which of the following is a key ecological role of bivalves?
- A) Habitat formation
- B) Water filtration
- C) Nutrient cycling
- D) All of the above
Answer: D) All of the above
- How do bivalves contribute to their ecosystems?
- A) By acting as predators
- B) By filtering water and improving water quality
- C) By providing food for other organisms
- D) B and C only
Answer: D) B and C only
- Which bivalve is commonly used for human consumption?
- A) Pearl oyster
- B) Zebra mussel
- C) Clam
- D) Sea cucumber
Answer: C) Clam
- What happens to bivalves when they are exposed to low oxygen levels?
- A) They thrive
- B) They migrate
- C) They may die or become inactive
- D) They reproduce
Answer: C) They may die or become inactive
- The largest bivalve species is:
- A) Tridacna gigas (Giant clam)
- B) Mytilus edulis (Blue mussel)
- C) Pinctada margaritifera (Black-lipped oyster)
- D) Crassostrea virginica (Eastern oyster)
Answer: A) Tridacna gigas (Giant clam)
- Which part of the bivalve’s body contains the vital organs?
- A) Mantle
- B) Visceral mass
- C) Foot
- D) Shell
Answer: B) Visceral mass
- Which of the following is a common way to harvest bivalves?
- A) Dredging
- B) Trawling
- C) Hand gathering
- D) All of the above
Answer: D) All of the above
- What is the primary purpose of the adductor muscles in bivalves?
- A) To aid in locomotion
- B) To open and close the shell
- C) To filter food
- D) To respire
Answer: B) To open and close the shell
- Bivalves have a simple nervous system characterized by:
- A) A centralized brain
- B) A series of ganglia
- C) Complex sense organs
- D) No nervous system
Answer: B) A series of ganglia
- What is the main threat to bivalve populations worldwide?
- A) Habitat loss
- B) Overharvesting
- C) Pollution
- D) All of the above
Answer: D) All of the above
- The “foot” of a bivalve is primarily used for:
- A) Attachment to substrates
- B) Locomotion
- C) Digging into sediment
- D) All of the above
Answer: D) All of the above
- Which bivalve is known for its unique ability to produce byssal threads for attachment?
- A) Scallop
- B) Clam
- C) Mussel
- D) Oyster
Answer: C) Mussel
- Which bivalve group is characterized by having siphons that extend into the water column?
- A) Burrowing bivalves
- B) Attached bivalves
- C) Free-living bivalves
- D) All of the above
Answer: A) Burrowing bivalves
- What is the significance of the byssus in mussels?
- A) Feeding
- B) Respiration
- C) Attachment
- D) Protection
Answer: C) Attachment
- The term “scallops” refers to which of the following characteristics?
- A) They have a smooth, flat shell
- B) They can swim by clapping their shells together
- C) They are primarily found in freshwater
- D) They do not have a shell
Answer: B) They can swim by clapping their shells together