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🔴Protochordates include Urochordates and cephalochordates.
🔴Vertebrata is divided into Agnatha and Gnathostomata.
🔴Term Agnatha refer to absence of jaws and it include the member of Cyclostomata.
🔴Gnathostomata is further divided into Pisces 🐟 and Tetrapods.
🔴Tetrapods include Amphibian, Reptiles, Birds and Mammals.
🔴Term Vertebrates is used for such chordates in which Notochord is replaced by the vertebral column that can be cartilaginous or Bony.
🔴But, all chordates do not have vertebral column that is notochord is not replaced into vertebral column.
🔴Therefore, all vertebrates are chordates but all chordates are not vertebrates.
🔴For example: In urochordates and cephalochordates, notochord is not replaced by vertebral column hence they are chordates but not vertebrates.
🔴Beside chordates characters, vertebrates has kidney for excretion and osmoregulation. Three and four chambered of muscular heart and fin or limb 🦵 for locomotion.
1. Consider the following fundamental features of Chordata and select the correct code
1. Dorsal nerve cord
2. Notochord
3. Pharyngeal gill slit
4. Dorsal heart
A. 1 2 and 3
B. 2 3 and 4
C. 1 3 and 4
D. 1 2 3 and 4
Answer: A
2. Which of the following feature was first appeared in the Chordata.
A. Triploblastic condition
B. Closed circulatory system
C. Post anal tail
D. Bilateral symmetry
Answer: C
3. Consider the following statement and select the correct code:
1. In Non chordates , central nervous system is ventral solid and double
2. In chordates, Central nervous system is dorsal hollow and single.
A. Only 1
B. Only 2
C. Both 1 and 2
D. Neither 1 nor 2
Answer: C
4. Consider the following Diagram and Select the corresponding option with A and B
A B
A. Gill slit Notochord
B. Notochord Gill slit
C. Nerve cord Noto chord
D. Notochord. Nerve cord
Answer: C
5. Which of the following group of Chordates are considered as Protochordates.
A. Urochordates and vertebrates
B. Cephalochordates and Vertebrates
C. Urochordates and Cephalochordates
D. Urochordates, Cephalochordates and Vertebrates
Answer: C
6. Which of the following group do not have Jaws.
A. Gnathostomata
B. Agnatha
C. Protochordates
D. Urochordates
Answer : B
7.In chordates which of the following is not dorsally located.
A. Heart
B. Nerve cord
C. Notochord
D. Central nervous system
Answer: A
8 . In which of following group , Notochord is replaced by the vertebral column.
A. Protochordates
B. Urochordates
C. Cephalochordates
D. Gnathostomata
Answer: D
9. Which of following statement is not correct.
A. In All chordates , notochord is replaced by vertebral column.
B. In all vertebrates, notochord is replaced by the vertebral column.
C. All chordates are not vertebrates.
D. All vertebrates are chordates.
Answer: A
10. Which of following statement is not correct.
A. Protochordates are divided into Urochordates and cephalochordates.
B. Vertebrata is divided into Agnatha and Gnathostomata
C.Gnathostomata is further divided into Pisces and Tetrapods.
D. Agnatha is divided into Amphibian, Reptiles, Birds and Mammals.
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