For what purposes we use spices?

For what purpose is the Zener diode generally used?

How do we get spices?

The bark of which plant is used as spices?

In middle ages what was the utility of spices?

A storage battery of emf 8.0 V and internal resistance 0.5 Omega is being charged by a 120 V dc supply using a series resistor of 15.5 Omega .What is the terminal voltage of the battery during charging? What is the purpose of using the series resistor in the charging circuit?

A trihydric alcohol is used for domestic purposes. Write its structural formula.

Name some animals which were used in agriculture. Now what do we used instead of those animals?

Name some rhizomes used as spice?

Purpose of tubectomy is -