Question

the type of population interaction seen between a cuscuta plant growing on a rose bush

Answer 1

The interaction between cascuta and
shoe flower plant is Parasitism.
In biology, parasitism is a relationship
between two organisms; a parasite and
host, lives together or inside another
organism, causing harm. The survival in
this relationship is based upon the
structural adaptability to this life style.
In this interaction, cascuta is a parasite
that infest shoe flower bush and
derives nutrients from it.