Hypopharynx acts as a tongue in cockroach and lies within cavity enclosed by the mouth parts.

The correct arrangement of the parts of digestive system in frog is as follows

Mouth $\rightarrow$ Buccal cavity $\rightarrow$ Oesophagus $\rightarrow$ Stomach $\rightarrow$ Intestine $\rightarrow$ Rectum $\rightarrow$ Cloaca $\rightarrow$ Cloacal aperture.

In frog respiration takes place via two means, i.e., skin and lungs.

Cutaneous respiration occrrs through highly vascular moist skin. It takes place in water as well as land.

Pulmonary respiration through lungs. It takes place outside the water.

In frog respiration takes place via two means, i.e., skin and lungs. Cutaneous respiration occrrs through highly vascular moist skin. It takes place in water as well as land.

Pulmonary respiration through lungs. It takes place outside the water.

Special venous connection between liver and intestine is called hepatic portal system and venus connection between the kidney and the lower parts of the frog is called renal portal system.