a. | A notochord |
b. | Ventral, solid, and double central nervous system |
c. | Pharynx perforated by gill slits |
d. | Ventral heart |
e. | Terminal anus and a lack of post-anal tail |
1. | a, c, and d only | 2. | a, b. and e only |
3. | a and c only | 4. | b, c, and d only |
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Statement I: | In Urochordata, notochord is present only in larval tail. |
Statement II: | In Cephalochordata, notochord extends from head to tail region and is persistent throughout their life. |
Statement III: | Both Urochordates and Cephalochordates are exclusively marine. |
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Statement I: | All vertebrates are chordates but all chordates are not vertebrates. |
Statement II: | Besides the basic chordate features, all vertebrates have at least a three-chambered heart and paired appendages. |
1. | Both Statement I and Statement II are correct but Statement II does not explain Statement I. |
2. | Statement I is correct and Statement II is incorrect. |
3. | Both Statement I and Statement II are incorrect. |
4. | Both Statement I and Statement II are correct and Statement II explains Statement I. |
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A | B | C | D | |
1. | Phylum | Cephalochordata | Urochordata | Protochordata |
2. | Division | Agnatha | Super-Class | Pisces |
3. | Phylum | Protochordata | Infra-class | Jawless fishes |
4. | Division | Agnatha | Sub-division | Pisces |
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Though all four features shown in the diagram of a generalized chordate appear at some point during development, they are actually named for:
1. | A | 2. | B |
3. | C | 4. | D |
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1. Ascidia | 2. Amphioxus |
3. Petromyzon | 4. Exocoetus |
The figure shows the mouth of a chordate. It can easily be seen that:
I. The mouth is circular | II. Jaw is absent. |
1. Ascidia | 2. Amphioxus |
3. Petromyzon | 4. Exocoetus |
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