Q. No.Metamerism evolved for the first time in the members of the Phylum:
1. Annelida
2. Platyhelminthes
3. Aschelminthes
4. Chordata
1. have a true coelom lined by embryonic mesoderm
2. have a closed circulatory system
3. do not reproduce by sexual methods
4. have a complete digestive system
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| 1. | Aquatic annelids like Nereis possess lateral appendages, parapodia, which help in swimming. |
| 2. | Nereis is dioecious. |
| 3. | Earthworm is monoecious. |
| 4. | Hirudinaria, blood-sucking leech, is an annelid that lacks true coelom and metamerism. |
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| I: | They are bilaterally symmetrical, triploblastic, non-segmented and pseudocoelomate animals. |
| II: | Arthropoda is the largest phylum of Animalia and includes more than 90 % of all species on the earth that are named so far. |
| III: | Insects are arthropods with body consisting of head, thorax and abdomen. |
| 1. | Only I | 2. | Only I and II |
| 3. | Only III | 4. | Only II and III |
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| Column I | Column II | ||
| A. | Insect reared for producing silk | P. | Locusta |
| B. | Mosquito acting as vector for Dengue virus | Q. | Bombyx |
| C. | Gregarious pest | R. | Limulus |
| D. | Living fossil | S. | Aedes |
Codes:
| A | B | C | D | |
| 1. | Q | S | P | R |
| 2. | Q | S | R | P |
| 3. | P | Q | R | S |
| 4. | R | P | Q | S |
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| 1. | It is the second largest animal Phylum after Phylum Arthropoda. |
| 2. | It includes animals that are bilaterally symmetrical, triploblastic, and coelomate. |
| 3. | Body is covered with a calcareous shell and is metamerically segmented with a distinct head, muscular foot, and visceral hump. |
| 4. | Gills are present in the mantle cavity, a space between the mantle and the hump. |
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| 1. | Pinctada | Pearl Oyster |
| 2. | Aplysia | Sea hare |
| 3. | Dentalium | Tusk shell |
| 4. | Loligo | Devil fish |
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| 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. |
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| 1. | Sea Urchin | 2. | Sea lily |
| 3. | Brittle star | 4. | Brain coral |
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| Statement 1: | Hemichordates were earlier considered as a sub-phylum under Phylum Chordata but are now placed separately in a phylum under non-Chordata. |
| Statement 2: | Hemichordates have a rudimentary structure in the collar region called stomochord, a structure homologous to the notochord. |
| 1. | Both Statement 1 and Statement 2 are correct but Statement 2 does not explain Statement 1. |
| 2. | Statement 1 is correct and Statement 2 is incorrect. |
| 3. | Both Statement 1 and Statement 2 are incorrect. |
| 4. | Both Statement 1 and Statement 2 are correct and Statement 2 explains Statement 1. |
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