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. |
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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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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. |
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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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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] |
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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 |
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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. |
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