what is the significance of opening and ending scenes?

Answer 1

basically the opening of a scene starts things out, kind of like a plot to follow, and it continues till the ending scene, which then concludes the whole story line.

Opening starts it

Ending finishes it

Answer 2

An opening scene sets things up and is meant to hopefully interest the reader in continuing the story. And ending scene draws the story to a close. Hopefully all loose ends have already been dealt with before the ending scene occurs so the ending seen can give the reader a final sense of fulfillment.