Q. No.The structure marked as ‘S’ in the given diagram helps bony fishes in:
1.
Oxygenation of blood
2.
Achieving neutral buoyancy
3.
Increasing absorptive surface area for food
4.
Protection of the nerve cord
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 bone structure in the following diagram shows:
| 1. | Adaptation for flight in birds |
| 2. | Presence of excess of the hemopoietic tissue in mammals |
| 3. | Rudimentary limb bones in some reptiles |
| 4. | Bone of forelegs of frogs |
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Common characteristic of fishes do not include:
| 1. | Single loop circulation |
| 2. | Vertebral column |
| 3. | Ability to synthesize aromatic amino acids |
| 4. | Internal gills |
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The second largest group of dueterostomes are:
| 1. | Echinoderms | 2. | Hemichordates |
| 3. | Chordates | 4. | Arthropods |
The closest relative of the vertebrates are:
1. Echinoderms
2. Lancelets
3. Tunicates
4. Hemichordates
Considering lampreys and hagfish:
| I. | Both groups have jawless mouths with horny epidermal structures that function as teeth. |
| II. | Both groups have branchial arches that are internally positioned instead of external as in jawed fishes. |
| 1. | Only I is correct |
| 2. | Only II is correct |
| 3. | Both I and II are correct |
| 4. | Both I and II are incorrect |
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 |
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