Clove is an _______ indicator.
Answer & explanation
Correct answer: option 2
The correct answer is option 2. Olfactory.
Clove is an olfactory (smell) indicator. The aroma of cloves can be used to detect and indicate certain characteristics or changes in a substance. While it is not as precise as chemical indicators, the smell of cloves is often employed informally to detect the presence of certain odors or changes in the environment.