- What is the common name for members of the class Polyplacophora?
- A) Clams
- B) Sea slugs
- C) Chitons
- D) Octopuses
Answer: C) Chitons
- How many plates are typically found on the dorsal surface of a chiton?
- A) 6
- B) 7
- C) 8
- D) 9
Answer: C) 8
- Which part of the chiton is used for scraping algae off rocks?
- A) Mantle
- B) Radula
- C) Foot
- D) Gills
Answer: B) Radula
- What type of habitat do chitons primarily inhabit?
- A) Freshwater
- B) Terrestrial
- C) Marine
- D) Brackish water
Answer: C) Marine
- The foot of a chiton is adapted for what function?
- A) Swimming
- B) Burrowing
- C) Attachment to surfaces
- D) Respiration
Answer: C) Attachment to surfaces
- Which structure in chitons is responsible for gas exchange?
- A) Mantle cavity
- B) Gills
- C) Foot
- D) Radula
Answer: B) Gills
- Chitons are primarily which type of feeder?
- A) Herbivores
- B) Carnivores
- C) Filter feeders
- D) Detritivores
Answer: A) Herbivores
- What is the main predator of chitons?
- A) Fish
- B) Sea stars
- C) Crabs
- D) Seagulls
Answer: B) Sea stars
- What is the outer covering of the plates in chitons made of?
- A) Calcium carbonate
- B) Chitin
- C) Keratin
- D) Silica
Answer: A) Calcium carbonate
- What do chitons use their foot for, aside from attachment?
- A) Reproduction
- B) Locomotion
- C) Feeding
- D) Respiration
Answer: B) Locomotion
- How do chitons respond to threats from predators?
- A) They swim away
- B) They burrow into the sand
- C) They curl up into a ball
- D) They camouflage
Answer: C) They curl up into a ball
- Which of the following is a key characteristic of Polyplacophora?
- A) Soft-bodied
- B) Possession of a coiled shell
- C) Presence of multiple overlapping shells
- D) Possession of fins
Answer: C) Presence of multiple overlapping shells
- What is the primary mode of locomotion for chitons?
- A) Jet propulsion
- B) Crawling
- C) Swimming
- D) Burrowing
Answer: B) Crawling
- What type of symmetry do chitons exhibit?
- A) Bilateral symmetry
- B) Radial symmetry
- C) Asymmetry
- D) Pentamerous symmetry
Answer: A) Bilateral symmetry
- In which geological era did chitons first appear?
- A) Paleozoic
- B) Mesozoic
- C) Cenozoic
- D) Precambrian
Answer: A) Paleozoic
- Which of the following is a method of reproduction in chitons?
- A) Budding
- B) Fragmentation
- C) Sexual reproduction
- D) Asexual reproduction
Answer: C) Sexual reproduction
- What type of body cavity do chitons have?
- A) Coelomate
- B) Pseudocoelomate
- C) Acoelomate
- D) None of the above
Answer: A) Coelomate
- What is the primary function of the mantle in chitons?
- A) Protection
- B) Digestion
- C) Circulation
- D) Respiration
Answer: A) Protection
- Chitons are closely related to which group of mollusks?
- A) Gastropods
- B) Bivalves
- C) Cephalopods
- D) Scaphopods
Answer: A) Gastropods
- Which of the following is a common genus of chitons?
- A) Acanthochitona
- B) Mytilus
- C) Loligo
- D) Nautilus
Answer: A) Acanthochitona
- How do chitons attach themselves to rocky surfaces?
- A) Using their tentacles
- B) Using their foot
- C) Using their radula
- D) Using their siphon
Answer: B) Using their foot
- The main diet of chitons consists of:
- A) Algae and other plant materials
- B) Other mollusks
- C) Small fish
- D) Detritus
Answer: A) Algae and other plant materials
- What environmental condition is most critical for chitons?
- A) Freshwater
- B) Salinity levels
- C) Temperature
- D) Depth of water
Answer: B) Salinity levels
- Which feature allows chitons to resist desiccation when exposed to air?
- A) Thick shell
- B) Mucous secretion
- C) Ability to burrow
- D) Compact body
Answer: B) Mucous secretion
- What anatomical feature allows chitons to have a strong grip on surfaces?
- A) Muscular foot
- B) Suckers
- C) Tentacles
- D) Radula
Answer: A) Muscular foot
- The structure used for excretion in chitons is called:
- A) Nephridia
- B) Gills
- C) Mantle
- D) Siphon
Answer: A) Nephridia
- Which of the following adaptations helps chitons to withstand wave action?
- A) Smooth shell
- B) Ability to cling to rocks
- C) Small size
- D) Camouflage
Answer: B) Ability to cling to rocks
- The largest chiton species belongs to which genus?
- A) Chiton
- B) Mopalia
- C) Cryptochiton
- D) Ischnochiton
Answer: C) Cryptochiton
- What type of ecological role do chitons primarily fulfill?
- A) Predators
- B) Herbivores
- C) Decomposers
- D) Parasites
Answer: B) Herbivores
- Chitons can be found at what depth range in marine environments?
- A) Intertidal to deep sea
- B) Only in shallow waters
- C) Only in deep sea
- D) In freshwater only
Answer: A) Intertidal to deep sea