Q. No.Ospharidia in mollusks are:
1.
Chemical sensors
2.
Balancing receptors
3.
Photoreceptors
4.
Chromatophores
Tagmatization, a feature of many arthropods, is:
| 1. | Presence of simple and compound eyes in the same animal |
| 2. | The process of moulting of exoskeleton during growth |
| 3. | Fusion of segments |
| 4. | Modification of mouth parts |
‘Madreporite’ is a part of:
| 1. | Excretory system of platyhelminthes |
| 2. | Water vascular system of echinoderms |
| 3. | Sensory system in mollusks |
| 4. | Feeding apparatus in Cnidarians |
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 |
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