Choose the correct option to complete the analogy.
Saw fish : Gill slits are present :: ________ : Gill slits are absent
1. Dog fish
2. Devil fish
3. Sting ray
4. Angel fish
Subtopic:  Comparative study of Cartilagenous & Bony Fishes | Class Chondrichthyes |
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Level 1: 80%+
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Given below are two statements: 
Assertion (A): Trygon is a poikilothermic animal.
Reason (R): Body temperature of Trygon changes with change in ambient temperature as they lack capacity to regulate their body temperature.
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.

 
Subtopic:  Comparative study of Cartilagenous & Bony Fishes | Class Chondrichthyes |
 90%
Level 1: 80%+
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Given below are two statements: 
Assertion (A): Pristis will sink if it stops swimming but Catla will not.
Reason (R): Pristis lacks swim bladder while Catla possesses swim bladder.
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.

 
Subtopic:  Comparative study of Cartilagenous & Bony Fishes | Class Chondrichthyes | Class Osteichthyes |
 89%
Level 1: 80%+
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The identifying characteristic of class Chondrichthyes

1. Gill slits are without operculum
2. Mouth is anterior in position
3. Tail is symmetrical
4. Scales are cycloid

Subtopic:  Comparative study of Cartilagenous & Bony Fishes | Class Chondrichthyes |
 87%
Level 1: 80%+
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Choose the correct option to complete the analogy.
Echinus : Calcareous ossicles : : Trygon : _____
1. Calcareous bones
2. Chitinous endoskeleton
3. Cartilaginous endoskeleton
4. Calcareous shell

 
Subtopic:  Comparative study of Cartilagenous & Bony Fishes | Class Chondrichthyes |
 86%
Level 1: 80%+
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Which of the following is not a cartilaginous fish?

1. Saw fish 2. Dog fish
3. Sea horse 4. Sting ray
Subtopic:  Comparative study of Cartilagenous & Bony Fishes | Class Chondrichthyes |
 82%
Level 1: 80%+
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Members of Chondrichthyes are characterised by all the following except:
1. Presence of a swim bladder
2. Ventrally located mouth
3. Lack of operculum
4. Placoid scales
Subtopic:  Comparative study of Cartilagenous & Bony Fishes | Class Chondrichthyes |
 81%
Level 1: 80%+
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Match each item in Column I with one item in Column II and select the best match from the codes given:
Column I (Common Name) Column II (Biological Name)
A. Flying Fish P. Pterophyllum
B. Sea Horse Q. Exocoetus
C. Rohu R. Hippocampus
D. Angel Fish S. Labeo
Codes:
Options A B C D
1 Q R S P
2 R S P Q
3 P Q R S
4 S P Q R
Subtopic:  Comparative study of Cartilagenous & Bony Fishes | Class Chondrichthyes | Class Osteichthyes |
 95%
Level 1: 80%+
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