Plants with structures that were more enticing to insects were favored. Insects that recognized and located particular plants had a competitive edge.
Insects are effective carriers of pollen from flower to flower as they visit to gather food.
Think Sporophyte and Gametophyte Plants reproduce sexually, often relying on pollinators to bring sperm and egg together. Meiosis of cells within flowers produces the small haploid gametophytes, which in turn produce either sperm or eggs. The specialized parts of the flower grow from the modified end of the floral shoot the receptacle. Where Pollen and Eggs Develop Male parts, called stamens, are located inside the corolla. Inside the anthers are pollen sacs in which pollen grains develop.