- 1(current)
Q. No.In which of these examples are the members exclusively chondrichthyes
| 1. | Scoliodon, Pristis, Labeo, Betta |
| 2. | Scoliodon, Pristis, Betta, Trygon |
| 3. | Scoliodon, Trygon, Pristis, Carcharodon |
| 4. | Scoliodon, labeo, Carcharodon, Pristis |
Which of the following statement/s about chondrichthyes are incorrect?
| 1) | Notochord is persistent throughout life |
| 2) | Endoskeleton is made up of bones |
| 3) | Operculum present |
| 4) | Skin is covered by placoid scales |
| 1. | All of the above |
| 2. | None of the above |
| 3. | 1 and 4 are incorrect |
| 4. | 2 and 3 are incorrect |
Which of the following characteristic features always holds true for the corresponding group of animals?
| 1. | Viviparous | Mammalia |
| 2. | Possess a mouth with an upper and a lower jaw | Chordata |
| 3. | 3-chambered heart with one incompletely divided ventricle | Reptilia |
| 4. | Cartilaginous – endoskeleton | Chondrichthyes |
A marine cartilaginous fish that can produce electric current is
1. Pristis
2. Torpedo
3. Trygon
4. Scoliodon
Select the correct option in respect of characteristics
of each group :-
|
Cyclostomes |
Chondrichthyes |
Osteichthyes |
|
|
(i) |
Marine |
Marine, Fresh water |
Marine |
|
(ii) |
Sucking mouth |
Ventral mouth |
Terminal mouth |
|
(iii) |
6-15 Pairs of Gills |
5-7 Pairs of Gills |
4 Pairs of Gills |
|
(iv) |
Placoid scales |
Cycloid Scales |
Ctenoid/ Ganoid |
| 1. | (i), (ii) are correct. |
| 2. | (i), (iii), (iv) are correct. |
| 3. | (ii), (iii) are correct. |
| 4. | (ii), (iii), (iv) are correct. |
Read the following statements :
| A. | Mouth is located ventrally. |
| B. | Notochord is persistent throughout life. |
| C. | Gill slits are seperate and with operculum. |
| D. | Air bladder are absent. |
How many of the above statements are correct for given
figure :
1. Four.
2. Three.
3. Two.
4. One
- 1(current)
Q. No.
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