Structural Organisation in Animals Test 9

Frog belongs to class Amphibia. It lives on land and in fresh water. The species Rana tigrina is the most common in India. Frogs are chordates and are poikilotherms. This means they do not have a constant body temperature.

Frogs are poikilothermic animals. This means that they have a fluctuating body temperature which varies with the environmental conditions, or they lack constant body temperature.

Frogs have the ability to change their color to defend themselves from predators. This phenomenon is known as camouflage and the protective coloration using which it hides in its surroundings is knows as mimicry.

Frogs have the ability to change color to protect themselves from predators. This camouflaging technique is called mimicry. They live in burrows to shelter themselves from extreme weather and they show both aestivation and hibernation.

The skin of a frog is smooth and slippery due to the presence of mucus. The skin has a moist characteristic which is maintained. A frog does not drink water but has the ability to absorb water through its skin.

The body of the frog is divided into a head and a trunk. Neck and tail are absent. Frogs are green with dark irregular spots on the dorsal side. On the ventral side, they are pale yellow in color.

The nictitating membrane protects the eyes of the frog in water. The tympanum is the ear of the frog. Cloaca are excretory organs. Bidder’s canal is a part of the male reproductive system of frogs.

The tympanum is the ear of frog. It receives sound signals from the environment. The tympanum is a membranous structure. The received environmental sound signals is then transmitted to the nervous system.

Each forelimb of frog has four digits while each hindlimb of frog has five digits. The hindlimbs are larger and more muscular than the forelimbs. The limbs are used for leaping, swimming and burrowing.

All frogs have characteristic moist, slippery skin. This is due to the secretion of mucus on the surface of the skin. Male frogs can be differentiated from female frogs by distinguishing features such as narrow abdomen, copulatory pad and vocal sacs.