Which of the following hormones is synthetic?

If shoot cuttings are treated with auxin,then:

If an etiolated stem is first saturated with auxin by spraying and then exposed to a streak of light from one side,it will:

The movement of a sunflower towards the direction of the sun is known as:

In plants,the precursor of auxins is:

Identify the functions of auxin and choose the correct option.
$I.$ Initiate rooting in stem cuttings
$II.$ Promote flowering in pineapples
$III.$ Controls xylem differentiation