Q. No.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
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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. |
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. | 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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| I: | Body is covered by dry and cornified skin, dermal scales or scutes. |
| II: | External ear is not present and tympanum represents the ear. |
| III: | Scales are shed as skin cast in all members. |
| IV: | Fertilization is internal and development is direct. |
| 1. | Only II is correct | 2. | Only II and IV are correct |
| 3. | All are correct | 4. | Only I and II are incorrect |
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| 1. | Crocodile | 2. | Wall lizard |
| 3. | Turtle | 4. | Tortoise |
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In birds:
| a: | the characteristic feature is the presence of feathers. |
| b: | forelimbs are modified into wings. |
| c: | flight is present in all members. |
| d: | hind limbs do not have scales. |
1. Only (a) and (d) are incorrect
2. Only (c) and (d) are correct
3. (a), (b) and (c) are correct
4. Only (a) and (b) are correct
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Birds are not characterized by:
1. a fully ossified endoskeleton
2. pneumatic long bones
3. absence of crop and gizzard in the digestive tract
4. a dry skin without glands except the oil gland
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