The main function of flowers is to attract pollinators to plants to ensure the reproduction and survival of the plant species. Many plants and pollinators have adapted characteristics to ensure a mutually beneficial relationship for each organism. Just as plants rely on bees, bats, moths and hummingbirds for help pollinating their flowers, these species depend on nectar and pollen from flowers for nutrition.
For instance, some flowers produce two types of pollen: one for pollination, and one to feed pollinators. Other flowers have intricate designs on their petals called nectar guides to help pollinators find the pollen within their flowers. The color, shape and fragrance of most flowers has evolved over thousands of years to benefit both the plant species and the pollinators that visit that flower.