- 1(current)
Q. No.The second intermediate host required by Clonorchis sinensis is:
| 1. | A snail | 2. | A fish |
| 3. | A crustacean | 4. | A coral |
Identify the incorrect comparison between a typical cartilaginous and a bony fish:
|
|
Characteristic |
Cartilaginous fish |
Bony fish |
|
1. |
Gill openings |
Not protected by an operculum |
Protected by an operculum |
|
2. |
Fertilization |
Internal |
Usually external |
|
3. |
Retina |
Lacks cones |
Has cones |
|
4. |
Conus arteriosus |
Absent |
Present |
The diagram below shows the body plan of a:
2. Cyclostome
3. Cartilaginous fish
4. Bony fish
Which of the following represents the correct combination without any exception?
| Characteristic | Class | |
| 1. | Mammary gland; hair on body; pinnae; two pairs of limbs | Mammalia |
| 2. | Mouth ventral; gills without operculum; skin with placoid scales; persistent notochord | Chondrichthyes |
| 3. | Sucking and circular mouth; jaws absent; integument without scales; paired appendages | Cyclostomata |
| 4. | Body covered with feathers; skin moist and glandular; lungs with air sacs; fore limbs from wings | Aves |
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Which of the following statements regarding Chondrichthyes may not be true for majority of members of the class?
| 1. | Notochord is persistent throughout life. |
| 2. | Skin has placoid scales. |
| 3. | Fertilization is internal. |
| 4. | Mouth is located ventrally. |
| COLUMN I | COLUMN II | ||
| A. | Petromyzon | P | A jawless vertebrate |
| B. | Icthyophis | Q | A limbless amphibian |
| C. | Struthio | R | A flightless bird |
Codes
| A | B | C | |
| 1. | Q | R | P |
| 2. | Q | P | R |
| 3. | P | Q | R |
| 4. | P | R | Q |
Identify the incorrect comparison between a typical cartilaginous and a bony fish:
|
|
Characteristic |
Cartilaginous fish |
Bony fish |
|
1. |
Usual shape |
Dorso-ventrally flattened |
Bilaterally flattened |
|
2. |
Exoskeleton |
Separate dermal placoid scales |
Overlapping dermal cosmoid, ganoid, cycloid or ctenoid scales |
|
3. |
Intromittent organ |
Males use pelvic fins as claspers |
Do not use claspers |
|
4. |
Mouth |
Variable shape and size at the tip or terminal part of the head |
Large, crescent shaped on the ventral side of the head |
- 1(current)
Q. No.
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