Bees are essential for agricultural pollination because they are efficient pollinators that help in the reproduction of many plants. They transfer pollen from the male part of the flower to the female part, which leads to the formation of fruits and seeds. This process is crucial for the production of many crops that humans rely on for food, such as fruits, vegetables, and nuts. Without bees, the pollination of these crops would be significantly reduced, leading to lower yields and potential food shortages.