- 1(current)
Q. No.Consider the given two statements:
| Assertion (A): | Hemichordata was earlier considered as a sub-phylum under phylum Chordata but now it is placed as a separate phylum under non-chordata. |
| Reason (R): | Hemichordates have a rudimentary structure in the collar region called stomochord, a structure analogous to notochord. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: Phylum Hemichordata |
71%
From NCERT
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In which of the following animals, the body is cylindrical and is composed of an anterior proboscis, a collar and a long trunk?
| 1. | Hemichordates | 2. | Urochordates |
| 3. | Cephalochordates | 4. | Vertebrate chordates |
Subtopic: Phylum Hemichordata |
93%
From NCERT
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The number of correct statements regarding hemichordates from the given is:
| I. | A stomochord is present in the collar region |
| II. | Circulation is of open type |
| III. | Excretory organ is proboscis gland |
| IV. | Development is indirect |
| 1. | 1 | 2. | 2 |
| 3. | 3 | 4. | 4 |
Subtopic: Phylum Hemichordata |
67%
From NCERT
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In hemichordates:
| 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 |
Subtopic: Phylum Hemichordata |
65%
From NCERT
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Hemichordates are not chordates because they lack a true:
1. gill slit
2. dorsal hollow nerve cord
3. notochord
4. post-anal tail
1. gill slit
2. dorsal hollow nerve cord
3. notochord
4. post-anal tail
Subtopic: Phylum Hemichordata |
79%
From NCERT
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Balanoglossus and saccoglossus are:
| 1. | Urochordates | 2. | Cephalochordates |
| 3. | Hemichordates | 4. | Vertebrate chordates |
Subtopic: Phylum Hemichordata |
85%
From NCERT
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