Pl. give ex(s) of mobile plants and sessile animals.

mobile plants - If you mean plants moving from one place to another just like animals, then we are having no such plants, though some plants have capability of either leaf, tendril or leaf-let movement ( eg - Mimosa pudica - touch- me- not plant  )

Sessile animals - Hydra , Sponges( sessile in maturity) , Jelly fish ( sessile in early stage)