What is the purpose of Herbarium?

What is the purpose of cracking ?

What is the purpose of anhydrous ZnCl_2 in the preparation of haloalkanes from alcohols ?

What is the purpose of ringing experiment?

What is the basic purpose of performing plant breeding in plants?

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 having a series resistor in the charging circuit?

Write uses of herbarium.