Q. No.Given below are two statements:
In the light of the above statements, choose the correct answer from the options given below:
| Statement I: | In sponges, the cells are arranged as loose cell aggregates, i.e., they exhibit cellular level of organisation. |
| Statement II: | Notochord is a mesodermally derived rod-like structure formed on the dorsal side during embryonic development in chordates. |
In the light of the above statements, choose the correct answer from the options given below:
| 1. | Both Statement I and Statement II are correct. |
| 2. | Both Statement I and Statement II are incorrect. |
| 3. | Statement I is correct but Statement II is incorrect. |
| 4. | Statement I is incorrect but Statement II is correct. |
Subtopic: Â Phylum Porifera |Â Phylum Chordata |
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Identify the animal phylum characterised by the presence of a notochord, dorsal hollow nerve cord, pharyngeal slits, and post-anal tail at some stage of their life:
1. Mollusca
2. Arthropoda
3. Echinodermata
4. Chordata
1. Mollusca
2. Arthropoda
3. Echinodermata
4. Chordata
Subtopic: Â Phylum Chordata |
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All of the following are characteristics of vertebrates, except:
| 1. | Presence of vertebral column in adults |
| 2. | Ventral muscular heart |
| 3. | Open circulatory system |
| 4. | Paired appendages (fins or limbs) |
Subtopic: Â Phylum Chordata |Â General Introduction: Vertebrates & Agnatha |
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Identify the structures A, B, C and D in the given figure:
| Structure A | Structure B | Structure C | Structure D | |
| 1. | Nerve cord | Notochord | Gill slits | Post-anal part |
| 2. | Notochord | Nerve cord | Spiracles | Tail fin |
| 3. | Spinal cord | Vertebral column | Nostrils | Caudal region |
| 4. | Neural tube | Backbone | Operculum | Anal fin |
Subtopic: Â Phylum Chordata |
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In which group of animals does the notochord appear only in the larval tail?
1. Urochordata
2. Cephalochordata
3. Vertebrata
4. Hemichordata
1. Urochordata
2. Cephalochordata
3. Vertebrata
4. Hemichordata
Subtopic: Â Phylum Chordata |
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Subtopic: Â Phylum Chordata |
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Notochord extends from head to tail and is persistent throughout its life in:
1. Doliolum
2. Salpa
3. Branchiostoma
4. Ascidia
1. Doliolum
2. Salpa
3. Branchiostoma
4. Ascidia
Subtopic: Â Phylum Chordata |
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Which of the following statements is true?
| 1. | All chordates are vertebrates |
| 2. | All vertebrates are chordates |
| 3. | Invertebrates possess a tubular nerve cord |
| 4. | Nonchordates have a vertebral column |
Subtopic: Â Phylum Chordata |
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Cyclostomes such as lampreys and hagfishes are characterised by:
| 1. | Jaws and paired fins |
| 2. | Cartilaginous endoskeleton and jaws |
| 3. | Circular mouth and absence of jaws |
| 4. | Bony skeleton and swim bladder |
Subtopic: Â Phylum Chordata |
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What type of mouth do cyclostomes have?
| 1. | Terminal mouth with jaws |
| 2. | Ventral mouth with powerful jaws |
| 3. | Sucking and circular mouth without jaws |
| 4. | Lateral mouth with teeth |
Subtopic: Â Phylum Chordata |
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