a) How do roche moutonnees and drumlins form? b) Can you tell the direction of ice flow from these features?

Roche moutonnees -

It is a rock formation created by passing of a glacier. when glacier ice pass over the underlying bed rock then often asymmetric erosion form on the stoss (which is in upstream direction) side of the rock and pluncking on the lee (which is in the downstream direction) side. This erosion feature is called Roche mountonnees.

Drumlin:

It is an elongated or oval hill, which is formed via the streamlined movement of the glacial ice sheets across the rock debris. It is generally found in lowland region with their long axes roughly parallel to path of glacial flow.

The side of glacier is always steep and high, while the lee side is tapered and smooth gently in the direction of ice movement.