Evolution and Phylogeny of Vertebrates
1. Which of the following is the most primitive group of living vertebrates?
A) Amphibians
B) Cartilaginous fish
C) Jawless fish (e.g., lampreys)
D) Mammals
Answer: C) Jawless fish (e.g., lampreys)
2. What is a defining feature of vertebrates?
A) Exoskeleton
B) Backbone or vertebral column
C) Open circulatory system
D) External fertilization only
Answer: B) Backbone or vertebral column
3. Which vertebrate class was the first to colonize land?
A) Amphibia
B) Reptilia
C) Mammalia
D) Aves
Answer: A) Amphibia
4. Birds are most closely related to which of the following?
A) Amphibians
B) Mammals
C) Dinosaurs (theropods)
D) Cartilaginous fish
Answer: C) Dinosaurs (theropods)
5. Which structure evolved to replace gills in most terrestrial vertebrates?
A) Nostrils
B) Lungs
C) Swim bladder
D) Diaphragm
Answer: B) Lungs
6. Which group includes all vertebrates with jaws?
A) Agnatha
B) Gnathostomes
C) Urochordates
D) Protochordates
Answer: B) Gnathostomes
7. Which of the following is not a characteristic shared by all chordates?
A) Notochord
B) Post-anal tail
C) Lungs
D) Dorsal nerve cord
Answer: C) Lungs
8. The presence of a four-limbed body plan defines which group of vertebrates?
A) Agnathans
B) Gnathostomes
C) Tetrapods
D) Anurans
Answer: C) Tetrapods
9. Which vertebrate group was first to develop the amniotic egg?
A) Amphibians
B) Reptiles
C) Fish
D) Mammals
Answer: B) Reptiles
10. Which group contains the most vertebrate species?
A) Birds
B) Amphibians
C) Mammals
D) Fish
Answer: D) Fish
11. Which of the following evolved most recently?
A) Amphibians
B) Cartilaginous fish
C) Reptiles
D) Mammals
Answer: D) Mammals
12. What does a phylogenetic tree show?
A) Fossil ages
B) DNA sequences
C) Evolutionary relationships
D) Environmental preferences
Answer: C) Evolutionary relationships
13. Which vertebrate group exhibits the highest level of parental care?
A) Fish
B) Amphibians
C) Mammals
D) Reptiles
Answer: C) Mammals
14. Which class of vertebrates is endothermic and lays hard-shelled eggs?
A) Amphibia
B) Aves
C) Mammalia
D) Reptilia
Answer: B) Aves
15. Which fossil is considered a transitional form between reptiles and birds?
A) Tiktaalik
B) Coelacanth
C) Archaeopteryx
D) Ichthyostega
Answer: C) Archaeopteryx
16. Which vertebrate group has members that evolved from lobe-finned fish?
A) Reptiles
B) Amphibians
C) Cartilaginous fish
D) Jawless fish
Answer: B) Amphibians
17. Which vertebrate class evolved first chronologically?
A) Mammalia
B) Reptilia
C) Pisces (fish)
D) Aves
Answer: C) Pisces (fish)
18. Which trait is a synapomorphy of mammals?
A) Gills
B) Hair
C) Amniotic egg
D) Scales
Answer: B) Hair
19. Which term refers to shared ancestry among vertebrates?
A) Analogy
B) Homology
C) Mutation
D) Adaptation
Answer: B) Homology
20. The evolutionary transition from water to land is most associated with which
structure?
A) Gills
B) Swim bladder
C) Lungs and limbs
D) Fins
Answer: C) Lungs and limbs
