Interesting science fact: Not all insect-pollinated flowers smell good. Flowers that attract flies / beetles as pollinators attract these insects with smells of rotting flesh or dung! An example of this is the Rafflesia flower, which can be over 100cm in diameter!
Science tip: Questions relating to the differences between insect- and wind-pollinated flowers seem to be quite common. I will post some of these in the future. In the meantime, refresh your memory with this table!