Q. No.Conchiolin is:
1.
A protein used in synthesis of shell by mollusks
2.
A respiratory pigment seen in some arthropods
3.
A toxin released by certain dinoflagellates
4.
A secondary metabolite produced by plants to avoid herbivory
Most corals obtain the majority of their energy and nutrients from photosynthetic zooxanthellae that are:
1. Dinoflagellates
2. Diatoms
3. Cyanobacteria
4. Chlamydomonas
During the embryonic development in echinoderms:
| 1. | left side of the body of bilaterally symmetrical larva grows at the expense of the right side |
| 2. | right side of the body of bilaterally symmetrical larva grows at the expense of the left side |
| 3. | the posterior part of the body undergoes torsion and comes to anterior end |
| 4. | the anterior part of the body undergoes torsion and comes to posterior end |
The body structure of a porifer shown in the given diagram is:
1. Asconoid
2. Syconoid
3. Leuconoid
4. Mucoid
A mutable collagenous tissue is seen in the members of:
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
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