Question

question 18
why are olfaction and gustation called chemical senses?
a they are unrelated to biological senses.
b neither one has sensory receptors that respond to molecules in the food we eat or in the air we breathe.
c we cannot use these senses without the presence of specific chemicals in the body.
d they have sensory receptors that respond to molecules in the food we eat or in the air we breathe.
1 point

Explanation:

Olfaction (smell) and gustation (taste) are chemical senses because they rely on sensory receptors that detect molecules. For olfaction, these molecules are in the air we breathe. For gustation, they are in the food we eat.

Answer:

D. They have sensory receptors that respond to molecules in the food we eat or in the air we breathe.