Slices of beetroot release pinkish colour in water . Which process is taking place herw? Describe another activity to show the same process taking place.

Slices of beetroot release pinkish colour in water due to osmosis. When the movement of solvent molecules (water) occurs from higher to lower concentration via semi-permeable membrane the pigment molecules of beetroot are released in water.
The raisins get swollen when kept in water (Imbibition) is an example similar to osmosis.