Pollination is the process of transferring pollen grains from their production site in pollen sacs on male seed plant structures to a receptive female site on the same or a different plant. Specifically, the pollen grains, which contain male, or sperm, cells, move from the anthers (the pollen-producing part of floral stamens, the male reproductive structure) of one flower to the stigma (the glandular female receptive portion) which is located in the pistil (female reproductive organ) of another flower. When a pollen grain lands on the female part of the flower, this male sex cell joins with the female sex cells in the flower in fertilization to form a seed from which a new plant can grow. The anthers and stigma can be on the same flower (self-pollination) or on different flowers (cross-pollination), but must be of the same species. Self-pollination is the simpler and more certain of...