Facts

Facts Classification Phylum : Chordata Class : Amphibia Order : Anura Genus : Rana Species : hexadactyla XI Std Biology-Zoology Chapter- The body of a frog is streamlined to help in swimming. It is dorso-ventrally flattened and is divisible into head and trunk. Body is covered by a smooth, slimy skin loosely attached to the body wall. The skin is dark green on the dorsal side and pale ventrally. The head is almost triangular in shape and has an apex which forms the snout. The mouth is at the anterior end and can open widely. Table . : Differences between a Frog and Toad Characters Frog Toad Family Ranidae Bufonidae Body shape Slender More Bulky Legs Longer Shorter Webbed feet present Absent Skin Smooth and moist skin Dry skin covered with wart like glands. Teeth Maxillary and vomerine teeth. Teeth absent. Egg formation Lays eggs in clusters. Lays eggs in strings. Figure . Rana hexadactyla - External morphology 8SSHUH\HOLG &ORDFDO DSHUWXUH ([WHQDOQRVWULO \PSDQXP 'LJLWV $QWHEUDFKLXP %UDFKLXP &UXV )HPXU 7RHV :HE 1LFWLWDWLQJ PHPEUDQH Order - Anura (Frogs and Toads) Frogs and toads have bodies specially ­designed for jumping with greatly elongated hind limbs. Frogs can live in water (aquatic), on land (terrestrial), or on trees (arboreal). Parental care is seen in few species. XI Std Biology-Zoology Chapter- the common opening for the digestive, excretory and reproductive systems. Fore limbs are short, stumpy, and helps to bear the weight of the body. They are also helpful for the landing of the frog after leaping. Each forelimb consists of an upper arm, fore arm and a hand. Hand bears four digits. Hind limbs are large, long and consist of thigh, shank and foot. Foot bears five long webbed toes and one small spot called the sixth toe. These are adaptations for leaping and swimming. When the animal is at rest, the hind limbs are kept folded in the form of letter ‘Z’ . Sexual dimorphism is exhibited clearly during the breeding season. The male frog has a pair of vocal sacs and a copulatory