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Q. No.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 |
55%
Level 3: 35%-60%
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Which of the following features will be seen in chordates but not in non-chordates?
| (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 |
Subtopic: Phylum Chordata |
74%
Level 2: 60%+
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Consider the given statements:
Which of the given statements is/ are true?
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
| 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
Subtopic: Phylum Chordata |
71%
Level 2: 60%+
Hints
Consider the two statements:
| 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. |
Subtopic: Phylum Chordata |
69%
Level 2: 60%+
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The number of correct statements from the given statements, regarding the members of Class Cyclostomata, is:
| (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 |
Subtopic: General Introduction: Vertebrates & Agnatha | Class Cyclostomata |
60%
Level 2: 60%+
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Regarding reproduction in Cyclostomes:
| 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 |
Subtopic: General Introduction: Vertebrates & Agnatha | Class Cyclostomata |
86%
Level 1: 80%+
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Chondrichthyes:
| 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 |
Subtopic: Comparative study of Cartilagenous & Bony Fishes | Class Chondrichthyes |
75%
Level 2: 60%+
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What would not be true regarding cartilaginous fishes?
| 1. | In males, pelvic fins bear claspers |
| 2. | Some of them have electric organs [Torpedo] |
| 3. | None of them is viviparous |
| 4. | Some possess poison sting [Trygon] |
Subtopic: Comparative study of Cartilagenous & Bony Fishes | Class Chondrichthyes |
81%
Level 1: 80%+
Hints
Identify the incorrect statement regarding bony fishes:
| I: | They have four pairs of gills which are covered by an operculum on each side. |
| II: | Due to the absence of air bladder, they have to swim constantly to avoid sinking. |
| III: | Skin is covered with placoid scales. |
| IV: | Mouth is mostly terminal. |
| 1. | Only II | 2. | Only II and III |
| 3. | Only I and IV | 4. | Only IV |
Subtopic: Comparative study of Cartilagenous & Bony Fishes | Class Osteichthyes |
62%
Level 2: 60%+
Hints
Which of the following is not a characteristic of Amphibians?
| 1. | Most have two pairs of limbs and tail is present in some. |
| 2. | Alimentary canal, urinary and reproductive tracts open into a common chamber called cloaca which opens to the exterior. |
| 3. | Respiration is by gills, lungs and through skin. |
| 4. | The heart is two chambered with one atrium and one ventricle. |
Subtopic: Study of Amphibians |
77%
Level 2: 60%+
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