- What is the primary characteristic of Chondrichthyes?
- A) They have bony skeletons.
- B) They have cartilaginous skeletons.
- C) They are warm-blooded.
- D) They possess lungs.
Answer: B) They have cartilaginous skeletons.
- Which of the following animals belongs to the class Chondrichthyes?
- A) Salmon
- B) Shark
- C) Goldfish
- D) Catfish
Answer: B) Shark
- What type of fins do most Chondrichthyes possess?
- A) Lobed fins
- B) Paired fins
- C) Filamentous fins
- D) Adipose fins
Answer: B) Paired fins
- Which of the following is a subclass of Chondrichthyes?
- A) Actinopterygii
- B) Elasmobranchii
- C) Agnatha
- D) Amphibia
Answer: B) Elasmobranchii
- How do Chondrichthyes primarily breathe?
- A) Through lungs
- B) Through gills
- C) Through skin
- D) Through swim bladders
Answer: B) Through gills
- Which of the following is NOT a characteristic of Chondrichthyes?
- A) Scales
- B) Jaws
- C) Swim bladder
- D) Cartilaginous skeleton
Answer: C) Swim bladder
- What is the primary diet of many Chondrichthyes?
- A) Herbivorous
- B) Carnivorous
- C) Omnivorous
- D) Parasitic
Answer: B) Carnivorous
- Which of the following is a known adaptation of sharks?
- A) Ability to fly
- B) Lateral line system
- C) Strong sense of smell only
- D) Colorful patterns
Answer: B) Lateral line system
- What type of reproduction do many Chondrichthyes exhibit?
- A) Oviparous
- B) Viviparous
- C) Ovoviviparous
- D) All of the above
Answer: D) All of the above
- What organ in Chondrichthyes helps in buoyancy control?
- A) Swim bladder
- B) Liver
- C) Gills
- D) Heart
Answer: B) Liver
- Which of the following is a feature of rays, a type of Chondrichthyes?
- A) Long, slender bodies
- B) Flattened bodies
- C) Smooth skin
- D) Large dorsal fins
Answer: B) Flattened bodies
- What is the main function of the ampullae of Lorenzini in Chondrichthyes?
- A) Detecting light
- B) Detecting temperature
- C) Detecting electric fields
- D) Detecting sound
Answer: C) Detecting electric fields
- Which of the following is a method sharks use to hunt?
- A) Hunting in packs
- B) Camouflage
- C) Ambush
- D) All of the above
Answer: D) All of the above
- What is the typical body shape of most Chondrichthyes?
- A) Cylindrical
- B) Flat
- C) Torpedo-shaped
- D) Boxy
Answer: C) Torpedo-shaped
- Which of the following structures are found in Chondrichthyes?
- A) Scales
- B) Hair
- C) Feathers
- D) None of the above
Answer: A) Scales
- What is the main feeding strategy of filter-feeding Chondrichthyes?
- A) Grazing on plants
- B) Sucking small fish
- C) Straining plankton from water
- D) Hunting larger prey
Answer: C) Straining plankton from water
- How many gill slits do most sharks have?
- A) 2
- B) 5 to 7
- C) 10
- D) 12
Answer: B) 5 to 7
- What is a common behavior observed in Chondrichthyes during mating?
- A) They form schools.
- B) They engage in courtship displays.
- C) They migrate to freshwater.
- D) They become solitary.
Answer: B) They engage in courtship displays.
- Which of the following statements about shark teeth is true?
- A) Sharks have only one set of teeth in their lifetime.
- B) Shark teeth are fused to the jaw.
- C) Sharks can replace their teeth multiple times.
- D) Shark teeth are not sharp.
Answer: C) Sharks can replace their teeth multiple times.
- What role do Chondrichthyes play in their ecosystems?
- A) They are primary producers.
- B) They are top predators.
- C) They are decomposers.
- D) They have no ecological role.
Answer: B) They are top predators.
- Which of the following is a well-known species of ray?
- A) Hammerhead shark
- B) Great white shark
- C) Manta ray
- D) Tiger shark
Answer: C) Manta ray
- What adaptation allows some Chondrichthyes to detect vibrations in water?
- A) Eyes
- B) Lateral line system
- C) Ampullae of Lorenzini
- D) Gill slits
Answer: B) Lateral line system
- What is the typical lifespan of many Chondrichthyes species?
- A) 5-10 years
- B) 15-30 years
- C) 30-50 years
- D) 50-100 years
Answer: D) 50-100 years
- Which of the following is an example of a filter-feeding Chondrichthyes?
- A) Great white shark
- B) Whale shark
- C) Bull shark
- D) Mako shark
Answer: B) Whale shark
- How do Chondrichthyes maintain their position in the water column?
- A) By swimming constantly
- B) Using swim bladders
- C) By manipulating body fluids
- D) By floating on the surface
Answer: A) By swimming constantly
- Which of the following statements about the reproduction of Chondrichthyes is true?
- A) All Chondrichthyes are oviparous.
- B) They all give birth to live young.
- C) They have diverse reproductive strategies.
- D) They reproduce only in freshwater.
Answer: C) They have diverse reproductive strategies.
- What adaptation do many Chondrichthyes have for hunting in low-light conditions?
- A) Enhanced sense of hearing
- B) Ability to see in color
- C) Enhanced sense of smell
- D) Bioluminescence
Answer: C) Enhanced sense of smell
- Which of the following is a major threat to Chondrichthyes populations?
- A) Overfishing
- B) Habitat destruction
- C) Pollution
- D) All of the above
Answer: D) All of the above
- What is the primary method of locomotion for Chondrichthyes?
- A) Crawling
- B) Swimming
- C) Jumping
- D) Gliding
Answer: B) Swimming
- Which of the following best describes the skin of Chondrichthyes?
- A) Smooth and hairless
- B) Covered in feathers
- C) Rough with dermal denticles
- D) Scaly like reptiles
Answer: C) Rough with dermal denticles