Statement I: | Echinoderms are spiny skinned animals |
Statement II: | They have an endoskeleton made of calcareous ossicles |
1. | Statement I is correct and Statement II is incorrect |
2. | Statement I is incorrect and Statement II is correct |
3. | Both Statement I and Statement II are correct |
4. | Both Statement I and Statement II are incorrect |
1. | Urochordates | 2. | Cephalochordates |
3. | Hemichordates | 4. | Vertebrate chordates |
Assertion (A): | Cartilaginous fishes have to swim continuously to avoid sinking |
Reason (R): | Cartilaginous fishes lack a swim bladder |
1. | Both (A) and (R) are True and (R) is the correct explanation of (A) |
2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. | (A) is True but (R) is False. |
4. | (A) is False but (R) is False. |
Statement I: | Cartilaginous fishes have internal fertilization |
Statement II: | Many cartilaginous fishes have viviparity |
1. | Statement I is correct and Statement II is incorrect |
2. | Statement I is incorrect and Statement II is correct |
3. | Both Statement I and Statement II are correct |
4. | Both Statement I and Statement II are incorrect |