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प्रश्न
Comment on the aquatic and terrestrial habits of amphibians.
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उत्तर
- The transition from aquatic to terrestrial living is clearly indicated in Amphibian.
- They are the first vertebrates to live on land.
- Amphibians have dual adaptation to living in aquatic and land environments.
- The double life is called amphibious.
- In frogs, the hind limbs have webbed feet.
- The skin is moist and glandular usually without scale.
- Respiration is by gills, lungs, skin and pharyngeal region.
- The heart has three chambers, with two auricles and a single ventricle.
- Fertilization is external.
- The larva is a tadpole, which is metamorphoses into an adult.
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| Phylum/Class | Excretory Organ | Circulatory Organ | Respiratory Organ |
| Arthropoda | Lungs/Gills/ Tracheal System | ||
| Nephridia | Closed | Skin/parapodia | |
| Metanephridia | Open | ||
| Amphibia | Closed | Lung |
