Question

explain the term of selfie pollination and cross pollination?

Answer 1

cross-pollination 

The definition of cross-pollination is when something grows or is stimulated by the introduction of a different element.

Answer 2

One of the two pollinia bends itself towards the stigma. Self-pollination is when pollen from the same plant arrives at the stigma of a flower (in flowering plants) or at the ovule (in Gymnosperms). There are two types of self-pollination: In autogamy, pollen is transferred to the stigma of the same flower.
 The transfer of pollen from an anther of a flower of one plant to a stigma of a flower of another plant of the same species. Also called allogamy, xenogamy.