Amphibian Characteristics of Frogs — NEET Biology
📚 Practice ConceptFrog shows amphibian characters. External morphology of the body is covered by skin. Mucous glands are present in the skin which is highly vascularised and helps in respiration in water and on land. Body is divisible into head and trunk. Eyes have eyelids. Tympanum is present at the tip and is used in capturing the prey. The alimentary canal consists of oesophagus, stomach, intestine and rectum which open into the cloaca. The main digestive glands are liver and pancreas. It can respire in water through skin and through lungs on land. Circulatory system is closed with a three chambered heart. The nervous system is differentiated into central, peripheral and autonomic. The organs of urinogenital system are kidneys and urinogenital ducts, which open into the cloaca. The male and female frogs are separate. Male frog can be distinguished by a pair of ovaries. A female lays 2500-3000 ova at a time. The fertilisation and development are external. The eggs hatch into tadpoles, which metamorphose into frogs.
Assertion (A): Frog development follows a specific sequence of stages. Reason (R): Frogs develop directly from eggs into adult forms without intermediate stages.
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