- 1(current)
Q. No.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 |
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| 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. |
2. Only I and II are correct
3. Only II and III are correct
4. I, II and III are correct
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| 1. | Petromyzon, Myxine |
| 2. | Ascidia, Salpa |
| 3. | Pristis, Doliolum |
| 4. | Branchiostoma, Balanoglossus |
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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.
- 1(current)
Q. No.
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