- What is the primary characteristic of Agnatha?
- A) They have jaws.
- B) They are jawless fish.
- C) They have a bony skeleton.
- D) They are amphibians.
Answer: B) They are jawless fish.
- Which of the following animals belong to the class Agnatha?
- A) Sharks
- B) Salmon
- C) Lampreys
- D) Frogs
Answer: C) Lampreys
- What type of skeleton do Agnatha possess?
- A) Bony skeleton
- B) Cartilaginous skeleton
- C) Composite skeleton
- D) Hydrostatic skeleton
Answer: B) Cartilaginous skeleton
- Which of the following is a characteristic feature of Agnatha?
- A) Paired fins
- B) Gills
- C) Lungs
- D) Scales
Answer: B) Gills
- Agnatha primarily inhabit which of the following environments?
- A) Terrestrial
- B) Freshwater and marine
- C) Desert
- D) Arboreal
Answer: B) Freshwater and marine
- What is the main dietary habit of many Agnatha species?
- A) Herbivorous
- B) Carnivorous
- C) Filter-feeding
- D) Parasitic
Answer: D) Parasitic
- Which of the following is a subclass of Agnatha?
- A) Elasmobranchii
- B) Petromyzontidae
- C) Actinopterygii
- D) Amphibia
Answer: B) Petromyzontidae
- What is the primary mode of reproduction in Agnatha?
- A) Asexual reproduction
- B) External fertilization
- C) Internal fertilization
- D) Budding
Answer: B) External fertilization
- Which organ is primarily responsible for respiration in Agnatha?
- A) Lungs
- B) Skin
- C) Gills
- D) Trachea
Answer: C) Gills
- How do Agnatha typically attach to their hosts?
- A) Using fins
- B) Using sucker-like mouths
- C) Using tentacles
- D) Using their tails
Answer: B) Using sucker-like mouths
- Which of the following best describes the mouth of Agnatha?
- A) It is large and filled with teeth.
- B) It is small and has no jaws.
- C) It is beak-like.
- D) It has a protruding jaw.
Answer: B) It is small and has no jaws.
- What is the typical body shape of Agnatha?
- A) Flattened
- B) Cylindrical
- C) Disc-shaped
- D) Boxy
Answer: B) Cylindrical
- Which of the following is NOT a feature of Agnatha?
- A) Lack of jaws
- B) Presence of a notochord
- C) Presence of paired fins
- D) Presence of gills
Answer: C) Presence of paired fins
- Which of the following Agnatha is known for its parasitic behavior?
- A) Hagfish
- B) Lamprey
- C) Both A and B
- D) None of the above
Answer: C) Both A and B
- What type of circulatory system do Agnatha have?
- A) Open circulatory system
- B) Closed circulatory system
- C) No circulatory system
- D) Lymphatic system
Answer: B) Closed circulatory system
- Which of the following is a common habitat for hagfish?
- A) Shallow waters
- B) Deep ocean
- C) Freshwater lakes
- D) Coral reefs
Answer: B) Deep ocean
- What is the primary function of the slime produced by hagfish?
- A) To aid in locomotion
- B) To attract prey
- C) To deter predators
- D) To assist in respiration
Answer: C) To deter predators
- Which of the following best describes the eyes of Agnatha?
- A) Highly developed
- B) Simple and not well-developed
- C) Compound
- D) Non-functional
Answer: B) Simple and not well-developed
- Which of the following statements about Agnatha is true?
- A) They have a fully developed jaw.
- B) They are the most primitive vertebrates.
- C) They possess scales.
- D) They can live both in water and on land.
Answer: B) They are the most primitive vertebrates.
- What is the approximate number of species in the class Agnatha?
- A) Less than 20
- B) 30-50
- C) 100-150
- D) Over 200
Answer: C) 100-150
- Which type of Agnatha is known for its ability to produce a large amount of slime?
- A) Lamprey
- B) Hagfish
- C) Both A and B
- D) None of the above
Answer: B) Hagfish
- What is the ecological role of Agnatha in marine ecosystems?
- A) Predators
- B) Scavengers
- C) Filter feeders
- D) Herbivores
Answer: B) Scavengers
- What type of feeding mechanism do lampreys utilize?
- A) Grazing
- B) Sucking blood
- C) Filter feeding
- D) Hunting
Answer: B) Sucking blood
- What is the main habitat preference for lampreys?
- A) Freshwater rivers and lakes
- B) Open ocean
- C) Rocky shorelines
- D) Coral reefs
Answer: A) Freshwater rivers and lakes
- What is the primary reproductive strategy of Agnatha?
- A) Oviparous
- B) Viviparous
- C) Ovoviviparous
- D) Budding
Answer: A) Oviparous
- Which of the following is a significant characteristic of hagfish?
- A) They have a complex jaw structure.
- B) They can tie themselves in knots.
- C) They have highly developed eyes.
- D) They have bony fins.
Answer: B) They can tie themselves in knots.
- What feature do both lampreys and hagfish share?
- A) They both have jaws.
- B) They both have cartilaginous skeletons.
- C) They both are filter feeders.
- D) They both have paired fins.
Answer: B) They both have cartilaginous skeletons.
- How do lampreys typically attach to their hosts?
- A) Using hooks
- B) Using suckers
- C) Using teeth
- D) Using fins
Answer: B) Using suckers
- Which of the following adaptations helps Agnatha survive in their environment?
- A) Colorful patterns
- B) The ability to produce slime
- C) Strong jaws
- D) Sharp teeth
Answer: B) The ability to produce slime
- What is a key difference between lampreys and hagfish?
- A) Lampreys are exclusively freshwater, while hagfish are marine.
- B) Hagfish have a true vertebral column, while lampreys do not.
- C) Lampreys have a complex circulatory system, while hagfish do not.
- D) Hagfish are predators, while lampreys are scavengers.
Answer: A) Lampreys are exclusively freshwater, while hagfish are marine.