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morphology of frog
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Frogs belong to class Amphibia of phylum chordata and kingdom Animalia. They are cold blooded animals.
Morphology of frog
❖ Body of a frog is divisible into head and trunk. A neck and tail are absent in mature frog.
❖ The body is dorso-ventrally compressed and ovoid in shape.
❖ The skin is thin, moist, slimy and smooth due to the presence of mucus. Mucus glands help them to maintain their skin in moist condition.
❖ The frogs never drink water through their mouth, but instead they absorb water through their skin.
❖ Head is flat, roughly triangular in outline and with a short blunt anterior snout terminating in a wide mouth.
❖ The trunk bears two pairs of limbs. They arise anteriorly from trunk just behind the head.
Morphology of Frogs
An adult frog has a stout body which is differentiated into head and trunk. Other external features are a pair of nostrils, protruding eyes, a membranous tympanum (ear), slippery/warty moist skin and webbed limbs. .The locomotion of frogs takes place with the help of their forelimbs and hind limbs.
Habitat of frog:
Frogs commonly dwell in or near water and in relatively damp areas on land.
Indian bull frog (Rana tigrina) lives in or near permanent freshwater lakes, ponds and streams.
It spends its most of the time in the water.
The reasons for why the frog reside near the water are:
To keep skin moist so as to perform cutaneous respiration.
To escape from enemies by jumping into the water.
Their oviposition, fertilization and embryonic development takes place in water.