Frog : Physiology

Question 1

Points to be included :

Answer 1

1. Shape
2. Size
3. Color
4. Body Division
5. Integument

Question 2

Shape :

Answer 2

• Spindle shaped
• Streamlined
• Anterior pointed and posterior blunt
• Bilaterally symmetrical

Question 3

Size :

Answer 3

The size of Rana tigrina is about 12 - 20 cm in length.

Question 4

Color :

Answer 4

-Smooth and moist
-Dorsal surface is green with black patches
- Ventral surface is yellowish white
- Light yellow line which runs mid-dorsally from nostril to the vent called mid-dorsal line.

Question 5

Body Division : Head
(Body is divided into head and trunk)

Answer 5

-Head :
1.Triangular in outline with pointed snout in front
2. Mouth is located ventrally almost at the tip of snout that extends transversally from ear-ear
3. At the tip of snot there are two small and oval openings called external nares or nostrils
4. Presence of large eyes covered by three eyelids
- Outer membranous covering of middle ear called tympanum
- Vocal sac in male

prominent upper eyelid, thin movable lower eyelid, nictitating membrane

Question 6

Body Division : Trunk

Answer 6

• Head is joined by trunk due to absence of neck
• Short, flattened
• Two pair of limbs arise : fore limbs and hind limbs
• Hind limbs are stronger
• Copulatory pad in males
• Each limb consists of proximal part called thigh or femur
• Webbed limbs

Question 7

Integument (Outermost layer) :

Answer 7

• Soft and Moist
• Lacks exoskeleton
• Two layers : outer epidermis and inner epidermis
• Forms horny layer - stratum corneum which is shed off from time to time which is called ecdysis or moulting
• Dermis - Inner layer than epidermis