In pour plating part, In 〖10〗^0, 〖10〗^(-1) and 〖10〗^(-2) number of colony decrease when dilute the sample and follow the theory. If we want to observed less number of colonies of microorganisms, we must use the 〖10〗^(-3),〖10〗^(-4) and 〖10〗^(-5) dilution