Class Amphibia
Class Amphibia
Class Amphibia (Greek: amphi:dual , bios-life)
Amphibian means animals which can live in water and on land.
These were the first land vertebrates (animals with backbones) to appear. Their limbs are adapted for walking and leaping. Most of them have two pairs of pentadactyle (with five digits) limbs. Some have fewer digits. Their skin is moist and without scales. They have a three-chambered heart with two auricles and a ventricle. Amphibians breed in water. Fertilization is external. The larvae (tadpoles) are aquatic They breathe through gills and have tails. Tadpoles undergo metamorphosis and change into adults which respire through lungs . The moist skin also helps in respiration.
Examples: Frog (Rana), toad (Bufo), tree frog (Hyla), salamanders (e.g., Triturus), and caecilians (e.g., Ichthyophis). Caecilians are limbless amphibians.
Fertilization is ___________ in Amphibia.
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| Right Option : A | |||
| View Explanation | |||
How does the larva of the frog differs from the adult frog ?
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| Right Option : D | |||
| View Explanation |
An organism with two pairs of petadactyle limbs which are adapted for walking and leaping and can live in water as well as on land belongs to ____________ phylum. | |||
| Right Option : A | |||
| View Explanation | |||
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