PREVIOUSLY ASKED IN:
WBPSC Miscellaneous Preliminary 2023
Answer
Crocodile
Explanation
A crocodile is not an amphibian; it is classified as a reptile. Amphibians generally start their lives in water (with gills) and transition to land (developing lungs), possessing smooth, permeable skin. Reptiles like crocodiles have dry, scaly skin and lay amniotic eggs on land. Frogs, salamanders, and newts are all classic examples of amphibians.
Key Points
- > Crocodiles, snakes, turtles, and lizards belong to Reptilia.
- > Frogs, toads, salamanders, and newts belong to Amphibia.
- > Most reptiles have a 3-chambered heart, but crocodiles have a 4-chambered heart.
- > Amphibians can breathe through their moist skin (cutaneous respiration).
- > Reptiles rely exclusively on lungs for respiration.
- > Amphibian eggs lack a hard shell, necessitating a watery environment.
- > Reptiles lay shelled, amniotic eggs on dry land.
Additional Information
Amphibians vs Reptiles
| Feature | Amphibians | Reptiles |
|---|---|---|
| Skin | Moist, smooth, no scales | Dry, scaly, thick |
| Examples | Frog, Newt, Salamander | Crocodile, Snake, Lizard |
| Eggs | Soft, laid in water | Shelled, laid on land |
| Heart | 3-chambered | 3-chambered (Crocs have 4) |
Memory Tips
- Think of Scales vs Slime. Reptiles (Crocs) have dry scales. Amphibians (Frogs, Newts) are slimy and moist.