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Q. No.All of the following are characteristics of vertebrates, except:
| 1. | Presence of vertebral column in adults |
| 2. | Ventral muscular heart |
| 3. | Open circulatory system |
| 4. | Paired appendages (fins or limbs) |
Subtopic: Â Phylum Chordata |Â General Introduction: Vertebrates & Agnatha |
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Level 1: 80%+
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In which class do animals possess an elongated body without jaws, paired fins, or scales, and are parasitic on fishes?
1. Cephalochordata
2. Urochordata
3. Cyclostomata
4. Cartilaginous Fishes
1. Cephalochordata
2. Urochordata
3. Cyclostomata
4. Cartilaginous Fishes
Subtopic: Â General Introduction: Vertebrates & Agnatha |Â Class Cyclostomata |
 89%
Level 1: 80%+
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Which of the following chordates is also a vertebrate but lacks a jaw?
1. Ascidia
2. Amphioxus
3. Scoliodon
4. Petromyzon
1. Ascidia
2. Amphioxus
3. Scoliodon
4. Petromyzon
Subtopic: Â General Introduction: Vertebrates & Agnatha |Â Class Cyclostomata |
 84%
Level 1: 80%+
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What is incorrect regarding cyclostomes?
| 1. | They are ectoparasites on some fishes |
| 2. | They have a circular mouth without jaws |
| 3. | Circulation is of open type |
| 4. | They are marine but migrate to fresh water for spawning |
Subtopic: Â General Introduction: Vertebrates & Agnatha |Â Class Cyclostomata |
 85%
Level 1: 80%+
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Q. No.
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