Write the function of the following in case of frog.
(i) Tongue (ii) Pigment cells (iii) Vocal sacs (iv) Mucous glands
(v) Tympanic membrane
(i) Tongue is used to capture the prey.
(ii) Pigment cells impart colour to the skin.
(iii) Vocal sacs raise pitch of the sound during croaking.
(iv) Mucous glands discharge their slimy mucus onto the surface of ducts passing through the epidermis.
(v) Tympanic membrane serves to receive the sound waves.