How many of the given statements are correct?
I. Cartilaginous fishes have cycloid or ctenoid scales.
II. An air bladder is present in bony fishes.
III. Amphibians have three-chambered heart.
IV. Reptiles have dermal scales.
V. Birds are warm-blooded.
1. 2
2. 3
3. 4
4. 5
Subtopic:  Comparative study of Cartilagenous & Bony Fishes | Study of Amphibians | Study of Reptilia | Study of Aves & Mammals |
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Given below are two statements: 

I: Amphibians and reptiles have a 3-chambered heart with two atria and a single ventricle, and are oviparous in nature 
II:  Crocodiles possess a 4 chambered heart with two ventricles and two atria and are viviparous in nature 

Select the most appropriate option:
1. I is correct but II is incorrect. 
2. I is incorrect but II is correct.
3. Both I and II are correct.
4. Both I and II are incorrect. 

Subtopic:  Study of Amphibians | Study of Reptilia |
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Diagrams (A, B, C and D) of four different animals are given below. Which one of the following option identifies the animal, its phylum and one of its characters correctly ?
  

Animal Phylum Character
B Rana Amphibia 3 – chambered heart
C Asterias Echinodermata Water canal system
A Aurelia Coelenterata Cnidoblast cells
D Naja Chordata Non-poisonous snake


1. B
2. C
3. A
4. D

Subtopic:  Phylum Coelenterata | Phylum Echinodermata | Phylum Chordata | Study of Amphibians |
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