<prompt> During the active phase of labour, the minimum effective dilatation of the cervix in primigravida should be at the rate of0.5 cmhour1 cmhour1.5 cmhour2.5 cmhour  <response>: Dilatation of cervix1cmhr in primigravidae1.5cmhr in multigravidaeD.C.DUTTA;S TEXTBOOK OF GYNECOLOGY, Pg no;130,7th edition 