How do we detect the smell of agarbatti?

Explanation:

produces fumes of pleasant smells.

the forebrain has regions that receive impulses from various receptor organs. so, when agarbatti reaches our nose, the receptors send electrical or chemical impulse via neurons to the forebrain.

When the smell of the incense stick reaches our nose, then the olfactory receptors present in our nose detect it send this information to the fore brain in the form of electrical signals. Fore brain interprets this information as the smell of incense stick where it is already stored.

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Explanation:

d. the weight of the book

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).   so the answer is a.