Question

how do insects help in cross pollination

Answer 1

As the insect moves to another flower of the same species, these pollen grains are transferred to the flower's stigma and pollination occurs. Perhaps the most well-known pollinator insects are bees and butterflies, but wasps, moths, flies and beetles can be pollinators as well.

Answer 2

the insects get stuck up the the pollen grains and the go another flower so the cross pollination takes place