- 1(current)
Q. No.The number of correct statements from the given statements, regarding the members of Class Cyclostomata, is:
| (a) | All living members are ectoparasites on some fishes. |
| (b) | The body bears 6-15 pairs of gill slits for respiration. |
| (c) | They have a sucking and circular mouth without jaws. |
| (d) | Their body is devoid of scales and paired fins. |
| (e) | Cranium and vertebral column are bony. |
| (f) | Circulation is of open type. |
| 1. | 3 | 2. | 4 |
| 3. | 5 | 4. | 6 |
Subtopic: Â General Introduction: Vertebrates & Agnatha |Â Class Cyclostomata |
 62%
From NCERT
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Regarding reproduction in Cyclostomes:
| I: | They are marine but migrate for spawning to fresh water. |
| II: | After spawning, within a few days, they die. |
| III: | Their larvae, after metamorphosis, return to the ocean. |
| 1. | Only II is correct |
| 2. | Only I and II are correct |
| 3. | Only II and III are correct |
| 4. | I, II and III are correct |
Subtopic: Â General Introduction: Vertebrates & Agnatha |Â Class Cyclostomata |
 91%
From NCERT
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Identify the pair of animals that are members of Class Cyclostomata:
| 1. | Petromyzon, Myxine |
| 2. | Ascidia, Salpa |
| 3. | Pristis, Doliolum |
| 4. | Branchiostoma, Balanoglossus |
Subtopic: Â General Introduction: Vertebrates & Agnatha |Â Class Cyclostomata |
 92%
From NCERT
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Identify the incorrect statement regarding cyclostomes:
| 1. | Lampreys have direct development, but Hagfishes go through a larval stage followed by metamorphosis into a juvenile form. |
| 2. | Unlike jawed vertebrates, which have three semicircular canals in each inner ear, lampreys have only two and hagfishes just one. |
| 3. | The hagfish blood is isotonic with seawater, while lampreys appear to use the same gill-based mechanisms of osmoregulation as marine teleosts. |
| 4. | Both hagfishes and lampreys have a single gonad. |
Subtopic: Â General Introduction: Vertebrates & Agnatha |Â Class Cyclostomata |
 58%
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NEET 2026 - Target Batch - Vital
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Q. No.
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