| Sycon – Scypha; Spongilla - Fresh water sponge; Euspongia - Bath sponge; Physalia -Portuguese man-of-war; Adamsia - Sea anemone; Pennatula - Sea-fan |
| Statement I: | Arthropoda is the largest phylum of Animalia. |
| Statement II: | Mollusca is the second largest animal phylum. |
| Statement III: | Ctenophora is the third largest animal phylum. |
| 1. | Statement I is correct; Statement II is correct; Statement III is incorrect |
| 2. | Statement I is correct; Statement II is correct; Statement III is correct |
| 3. | Statement I is correct; Statement II is incorrect; Statement III is incorrect |
| 4. | Statement I is incorrect; Statement II is correct; Statement III is incorrect |
| I: | All members of Animalia are multicellular. |
| II: | All members with triploblastic organisation have bilateral symmetry as adults. |
| III: | Sponges are mostly radially symmetrical. |
| IV: | An undifferentiated layer, mesoglea, is present in between the ectoderm and the endoderm in triplobalstic organisms. |
| 1. | Echinodermata | 2. | Porifera |
| 3. | Cnidaria | 4. | Mollusca |
| A | B | C | |
| 1 | Pseudocoelomate | Acoelmate | Eucoelomate |
| 2 | Acoelmate | Pseudocoelomate | Acoelmate |
| 3 | Acoelmate | Pseudocoelomate | Eucoelomate |
| 4 | Acoelomate | Pseudocoelomate | Pseudocoelomate |
| I: | Cnidoblasts |
| II: | Triploblastic organisation |
| III: | Well developed polyp stage in life cycle |
| I: | The body is segmented metamerically. |
| II: | The symmetry is bilateral and they have a true coelom |
| I: | having radial symmetry in adults and larvae |
| II: | having three germ layers |
| III: | lacking a coelom |
| I: | lacks a coelom |
| II: | is triploblastic |
| III: | is expected to have bilateral symmetry |
| IV: | is expected to be dorso-ventrally flattened |