What is the defining characteristic of chordates?
A) Exoskeleton
B) Segmented body
C) Notochord
D) Jointed appendages
Answer: C) Notochord
Which subphylum includes vertebrates with jaws?
A) Urochordata
B) Cephalochordata
C) Myxini
D) Vertebrata
Answer: D) Vertebrata
In chordates, the nerve cord is located:
A) Ventral to the notochord
B) Dorsal to the notochord
C) Alongside the notochord
D) Absent in chordates
Answer: B) Dorsal to the notochord
Which class includes mammals, reptiles, birds, and amphibians?
A) Mammalia
B) Reptilia
C) Aves
D) Amphibia
Answer: A) Mammalia
The pharyngeal slits in chordates are involved in:
A) Hearing
B) Respiration
C) Filter feeding
D) Thermoregulation
Answer: C) Filter feeding
Which chordate subphylum includes animals known as lancelets?
A) Urochordata
B) Cephalochordata
C) Myxini
D) Vertebrata
Answer: B) Cephalochordata
What is the primary function of the notochord in chordates?
A) Filter feeding
B) Structural support
C) Gas exchange
D) Locomotion
Answer: B) Structural support
Which group of chordates is characterized by a cartilaginous skeleton and includes sharks and rays?
A) Urochordata
B) Cephalochordata
C) Myxini
D) Chondrichthyes
Answer: D) Chondrichthyes
The amniotic egg is a characteristic feature of which class of chordates?
A) Mammalia
B) Reptilia
C) Aves
D) Amphibia
Answer: B) Reptilia
In chordates, the post-anal tail is:
A) Absent
B) Found only in larvae
C) Reduced in adults
D) Present in both larvae and adults
Answer: D) Present in both larvae and adults