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. |
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.
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