A receptor is the organ or cells which gives the response to the external stimuli such as light, touch, smell etc. There are various receptors in animals such as:-
Photoreceptor- This receptor gives the response to the light.
Olfactory receptor- This receptor gives the response to smell.
Gustatory cell of receptor- This gives the response to the taste.
Thermoreceptor- This receptor gives response to temperature.
Phonoreceptor- This receptor gives response to sound.
Mechanoreceptor- this receptor gives the response to pressure change.