What adaptations to pollination do insect pollinated plants have?

Many flowering plants are pollinated by insects. For this, they have some adaptations. They have sweet nectar and pollen, which insects collect. But in order for insects to notice pollen from a height, plants received petals with different colors of pigments in the cells during evolution. This makes the flower stand out from other plants and attracts insects. Insects become pollen carriers by accident, due to the presence of hairs on their bodies. If you look at a bee, you can see that it is covered in pollen while collecting nectar.