Transpiration is the way plants use water to carry nutrients through their structure. When additional water is unavailable to the roots, as in winter or drought, wilting and potential plant damage can occur. Pollination is the transport of pollen from the anther onto the stigma. Pollen can be carried by insects, other animals or wind. This union of egg and sperm is called fertilization.
Fertilization results in an embryo which develops inside protective layers of tissue.
The embryo and protective layers are called a seed. The fragrance, nectar and color of flowers attract insects, birds and mammals. They carry pollen to the stigma resulting in pollination. Flowers lacking showy petals, as in many deciduous trees, are usually pollinated by the wind. The structure of the flower often gives clues about the mechanism for pollination.