Statement I: | Coelenterates, ctenophores and echinoderms have bilateral symmetry as larvae and radial symmetry as adults. |
Statement II: | Animals like annelids and arthropods exhibit bilateral symmetry. |
1. | Statement I is correct; Statement II is incorrect |
2. | Statement I is correct; Statement II is correct |
3. | Statement I is incorrect; Statement II is incorrect |
4. | Statement I is incorrect; Statement II is correct |
I: | commonly known as sea walnuts or comb jellies |
II: | exclusively marine |
III: | body bears eight external rows of ciliated comb plates |
IV: | bioluminescence (the property of a living organism to emit light) is well-marked |
1. | Cnidaria and ctenophora are radially symmetrical organisms. |
2. | Platyhelminthes are acoelomates. |
3. | Aschelminthes are pseudocoelomates. |
4. | Annelida are true coelomates. |
Assertion (A): | Cyclostomes are chordates but not vertebrates. |
Reason (R): | Cyclostomes lack a vertebral column but have a notochord. |
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 and (R) is False. |
1. | Cnidoblasts | 2. | Nematocysts |
3. | Colloblasts | 4. | Grey cells |
1. | choanocytes | 2. | porocytes |
3. | pinacocytes | 4. | colloblasts |
I: | All are marine. |
II: | The adults are radially symmetrical. |
III: | An excretory system is absent. |
IV: | Development is indirect with free-swimming larva. |