- 1(current)
Q. No.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: Â Comparative study of Cartilagenous & Bony Fishes |Â Class Chondrichthyes |
 75%
Level 2: 60%+
Hints
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: Â Comparative study of Cartilagenous & Bony Fishes |Â 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: Â Comparative study of Cartilagenous & Bony Fishes |Â Class Osteichthyes |
 62%
Level 2: 60%+
Hints
- 1(current)
Q. No.
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