Question

External ear is absent but tympanum is present in ........... of following animals.
A) Toad
B) Shark
C) Sea horse D) Snake​

Answer 1

Answer:

D. Snake doesn't has external ear but tympanum is present in them

Answer 2

The external ear is absent but the tympanum is present in the toad. (Option a)

• Toads do not have an outer or external ear.
• They only have the middle and inner ear and it is surrounded by the tympanic cartilage and membranes.
• The tympanum is the eardrum and is also referred to as tympanic membranes.
• This term is mostly used to denote the eardrum of amphibians and insects and is not used for humans.
• In the toad, it is situated behind the eyes that appear as a thin circular patch of skin.
• The function of this membrane is to direct the sound waves to the middle and inner ear.
• Sharks, sea horses, and snakes only have inner ears and they lack both external ear and tympanum.