- 1(current)
Q. No.| 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 1: In Urochordata, notochord is present only in larval tail.
Statement 2: In Cephalochordata, notochord extends from head to tail region and is persistent throughout their life.
Statement 3: Both Urochordates and Cephalochordates are exclusively marine.
Which of the given statements is/ are true?
1. Only statement 1 and statement 2
2. Only statement 1 and statement 3
3. Only statement 2 and statement 3
4. Statement 1, statement 2, and statement 3
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Statement 1: All vertebrates are chordates but all chordates are not vertebrates.
Statement 2: Besides the basic chordate features, all vertebrates have at least a three-chambered heart and paired appendages.
1. Both Statement 1 and Statement 2 are correct but Statement 2 does not explain Statement 1.
2. Statement 1 is correct and Statement 2 is incorrect.
3. Both Statement 1 and Statement 2 are incorrect.
4. Both Statement 1 and Statement 2 are correct and Statement 2 explains Statement 1.
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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. |
This chordate can be:
| 1. Ascidia | 2. Amphioxus |
| 3. Petromyzon | 4. Exocoetus |
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- 1(current)
Q. No.
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