Pila, Echinus, Pinctada, Sepia, Loligo, Cucumaria, Octopus, Limulus, Chaetopleura |
An important evolutionary transition that appeared for the first time in Echinoderms is:
1. | Bilateral symmetry | 2. | Radial symmetry |
3. | Tube within a tube plan | 4. | Endoskeleton |
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. | They have bilateral symmetry as adults and radial symmetry as larvae. |
2. | They are triploblastic and coelomates. |
3. | They possess a well-developed excretory system. |
4. | They have an incomplete digestive system. |
I: | Digestive system is complete with mouth on the lower (ventral) side and anus on the upper (dorsal) side. |
II: | An excretory system is absent. |
A water vascular system is characteristically present in:
1. | Annelids | 2. | Porifers |
3. | Echinoderms | 4. | Cartilaginous fishes |
Assertion (A): | Echinoderms have a water vascular system. |
Reason (R): | The water vascular system is used for locomotion, capturing food, and respiration. |
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. | Both (A) and (R) are False. |
Assertion (A): | Echinoderms are exclusively marine animals. |
Reason (R): | Echinoderms have a water vascular system that functions in locomotion, feeding, and respiration. |
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 True. |
I: | All are marine. |
II: | The adults are radially symmetrical. |
III: | An excretory system is absent. |
IV: | Development is indirect with free-swimming larva. |
1. | Asterias, Echinus, Antedon, and Ophiura |
2. | Balanoglossus, Saccoglossus and Amphioxus |
3. | Pinctada, Aplysia, Dentalium, and Obelia |
4. | Laccifer, Bombyx, Trypanosoma and Periplaneta |