However, Bancroft was suspended on a cheap 10 after he was ran out by Chris Woakes as England were beginning to despair of breaking the opening partnership.
Waokes also claimed Warner at 47 to help Root defend his decision of bowling first.
Coming to bat on number 3, Usman Khawaja was the only player for who managed a half century on the Day 1.
But James Anderson uprooted the settled Khawaja (53), thanks to an exceptional James Vince catch.
England when steps in the ground on new day will look to not let go in vain the early and precious wicket of Smith.
Australia will resume the day with new ball on Sunday afternoon with Peter Handscomb and Shaun Marsh batting at 35 and 19 respectively. (ANI)