Q. No.A mutable collagenous tissue is seen in the members of:
1. Cnidaria
2. Platyhelminthes
3. Mollusks
4. Echinoderms
1. Cnidaria
2. Platyhelminthes
3. Mollusks
4. Echinoderms
Consider the two statements:
| I: | Platyhelminthes are restricted to environments where dehydration is unlikely. |
| II: | They are dorso-ventrally flattened. |
1. Both I and II are correct and II explains I
2. Both I and II are correct but II does not explain I
3. Only I is correct
4. Both I and II are incorrect
A unique feature in nematodes is:
1. Moulting of cuticle
2. A blind sac body plan
3. Females are much smaller than males
4. Projections run from the inner surface of muscle cells towards the nerve cords
Consider the two statements:
| I. | Moulting may be responsible for 80 to 90% of all arthropod deaths. |
| II. | The exoskeleton cannot stretch and thus restricts growth and hence moulting. |
| 1. | Both I and II are correct and II explains I |
| 2. | Both I and II are correct but II does not explain I |
| 3. | Only I is correct |
| 4. | Both I and II are incorrect |
Consider the two statements:
| I. | The similarity between notochord and stomochord is due to convergent evolution. |
| II. | Both arise from a common ancestry and exhibit homology. |
| 1. | Both I and II are correct and II explains I |
| 2. | Both I and II are correct but II does not explain I |
| 3. | Only I is correct |
| 4. | Both I and II are incorrect |
A viviparous nematode is:
1. Enterobius vermicularis
2. Trichuris trichiura
3. Trichinella spiralis
4. Ascaris lumbricoides
A trochophore larva is shared by members of:
1. Molluscs and Annelids
2. Molluscs and Arthropods
3. Annelids and Arthropods
4. Molluscs and Nematodes
A very rare reproductive system seen in Coenorhabditis elegans is described as:
1. Androdioecy
2. Faculatative sexuality
3. Meiotic parthenogenesis
4. Mitotic parthenogenesis
All mollusks do not have:
| I. Open circulatory system | II. A shell | III. Radula |
| 1. | I and II only | 2. | I and III only |
| 3. | II and III only | 4. | I, II and III |
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