(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 |
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 |
1. | Petromyzon, Myxine |
2. | Ascidia, Salpa |
3. | Pristis, Doliolum |
4. | Branchiostoma, Balanoglossus |