Question

A dog pants with its tongue sticking out on a hot day. Which of the following is the correct reason?

• A. It is its habit
• B. Producing more saliva cools down the body temperature.
• C. Saliva vapourises, cooling the tongue
• D. It is a genetic disease found in few animals like dogs.

Answer 1

The correct option is C Saliva vapourises, cooling the tongue

Evaporation causes cooling.
A dog pants with its tongue sticking out on a hot day because its saliva vapourises, cooling the tongue.