Q. No.Consider the given two statements:
Statement 1:
Hemichordates were earlier considered as a sub-phylum under Phylum Chordata but are now placed separately in a phylum under non-Chordata.
Statement 2:
Hemichordates have a rudimentary structure in the collar region called stomochord, a structure homologous to the notochord.
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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| 1. | Circulatory system is a closed type |
| 2. | Proboscis gland is a digestive gland that secretes a large number of hydrolytic enzymes |
| 3. | Respiration takes place through the gills |
| 4. | Sexes are not separate, fertilization is internal and development is direct |
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| (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. |
1. Only Statement I and Statement II
2. Only Statement I and Statement III
3. Only Statement II and Statement III
4. Statement I, Statement II, and Statement III
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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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| (a) | All living members are ectoparasites on some fishes. |
| (b) | The body bears 6-15 pairs of gill slits for respiration. |
| (c) | They have a sucking and circular mouth without jaws. |
| (d) | Their body is devoid of scales and paired fins. |
| (e) | Cranium and vertebral column are bony. |
| (f) | Circulation is of open type. |
| 1. | 3 | 2. | 4 |
| 3. | 5 | 4. | 6 |
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| I: | They are marine but migrate for spawning to fresh water. |
| II: | After spawning, within a few days, they die. |
| III: | Their larvae, after metamorphosis, return to the ocean. |
| 1. | Only II is correct |
| 2. | Only I and II are correct |
| 3. | Only II and III are correct |
| 4. | I, II and III are correct |
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| 1. | Petromyzon, Myxine |
| 2. | Ascidia, Salpa |
| 3. | Pristis, Doliolum |
| 4. | Branchiostoma, Balanoglossus |
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| 1. | are marine animals and have cartilaginous endoskeleton |
| 2. | have a mouth located dorsally |
| 3. | have teeth that are modified cycloid or ctenoid scales directed backwardly |
| 4. | have the capacity to regulate their body temperature |
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