The board may provide for one or several issues of bonds and may issue bonds in series or may divide any issue into one or more divisions and fix different maturities or dates of such bonds, different rates of interest, or prescribe different terms and conditions for the bonds of the several series or divisions. It is not necessary that all bonds of the same authorized issue be of the same kind or character, have the same security, or be of the same interest rate, but the terms thereof shall in each case be provided for by the board at or prior to the issue thereof.