Which of the following is not seen in hemichordates?
1. A tripartite body organization
2. Stomochord
3. Rudimentary notochord
4. Proboscis gland
An important characteristic that hemichordates share with chordates is
1. absence of notochord
2. ventral tubular nerve cord
3. pharynx with gill slits
4. pharynx without gill slits
Match the following and select the correct option.
| 1. | A-3 B-5 C-2 D-1 E-4 |
| 2. | A-3 B-1 C-5 D-2 E-4 |
| 3. | A-1 B-2 C-3 D-4 E-5 |
| 4. | A-2 B-3 C-4 D-1 E-5 |
Which of the following is true for Hemichordata?
1. Earlier placed under phylum of Chordata
2. Now placed under Non- Chordata
3. Notochord is absent
4. All of these
Which is incorrect for Hemichordata?
1. Cylindrical body
2. Proboscis, Collar and Trunk present
3. Bilaterally symmetrical
4. Head, Collar and Trunk present
Which of the following is the distinctive feature of Hemichordata?
1. Worm like animals
2. Body is composed of Proboscis, Collar and Trunk
3. Notochord present
4. Both A and B
Which of the following is not true for the given diagram?
1. Worm like animals
2. Closed circulatory system
3. Respiration through gills
4. Excretion through proboscis gland
Which of the following is incorrect for the given diagram?
1. Dioecious
2. External fertilisation
3. Indirect development
4. Saccoglossus
Match the following group of organisms with their respective distinctive characteristics and select the correct option:
|
Organisms |
Characteristics |
||
|
(a) |
Platyhelminthes |
(i) |
Cylindrical body with no segmentation |
|
(b) |
Echinoderms |
(ii) |
Warm blooded animals with direct development |
|
(c) |
Hemichordates |
(iii) |
Bilateral symmetry with incomplete digestive system |
|
(d) |
Aves |
(iv) |
Radial symmetry with indirect development |
| Options: | (a) | (b) | (c) | (d) |
| 1. | (iii) | (iv) | (i) | (ii) |
| 2. | (ii) | (iii) | (iv) | (i) |
| 3. | (iv) | (i) | (ii) | (iii) |
| 4. | (i) | (ii) | (iii) | (iv) |
| 1. | Myxine | 2. | Ascidia |
| 3. | Saccoglossus | 4. | Branchiostoma |
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