Q. No.Identify the incorrect statement regarding echinoderms:
1.
Echinoderms evolved from animals with bilateral symmetry.
2.
Echinoderms have a mesodermal skeleton composed of calcareous plates or ossicles.
3.
Most echinoderms are not able to reproduce asexually and regenerate tissues, organs, and limbs.
4.
Echinoderms are also the largest phylum that has no freshwater or terrestrial (land-based) representatives.
The second largest group of dueterostomes are:
| 1. | Echinoderms | 2. | Hemichordates |
| 3. | Chordates | 4. | Arthropods |
The tunic of urochordates is composed of proteins and complex carbohydrates, and includes tunicin, which is a variety of:
| 1. | cellulose | 2. | amylopectin |
| 3. | agaropectin | 4. | alginic acid |
Identify the incorrect comparison between a typical cartilaginous and a bony fish:
|
|
Characteristic |
Cartilaginous fish |
Bony fish |
|
1. |
Usual shape |
Dorso-ventrally flattened |
Bilaterally flattened |
|
2. |
Exoskeleton |
Separate dermal placoid scales |
Overlapping dermal cosmoid, ganoid, cycloid or ctenoid scales |
|
3. |
Intromittent organ |
Males use pelvic fins as claspers |
Do not use claspers |
|
4. |
Mouth |
Variable shape and size at the tip or terminal part of the head |
Large, crescent shaped on the ventral side of the head |
Identify the incorrect comparison between a typical cartilaginous and a bony fish:
|
|
Characteristic |
Cartilaginous fish |
Bony fish |
|
1. |
Gill openings |
Not protected by an operculum |
Protected by an operculum |
|
2. |
Fertilization |
Internal |
Usually external |
|
3. |
Retina |
Lacks cones |
Has cones |
|
4. |
Conus arteriosus |
Absent |
Present |
Ospharidia in mollusks are:
| 1. | Chemical sensors | 2. | Balancing receptors |
| 3. | Photoreceptors | 4. | Chromatophores |
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 |
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 |
The second intermediate host required by Clonorchis sinensis is:
| 1. | A snail | 2. | A fish |
| 3. | A crustacean | 4. | A coral |
Identify the correct statements regarding arthropods:
| I: | All arthropods use internal fertilization |
| II: | All arthropods lay eggs |
| III: | All arthropods' embryos are segmented |
| 1. | Only II | 2. | Only III |
| 3. | Only I and II | 4. | None |
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