Fertilisation the Greek composite word γυμνόσπερμος (γυμνός gymnos, "naked" and σπέρμα sperma, "seed"), meaning "naked seeds", after the unenclosed condition of their seeds (called ovules in their unfertilised state). Their naked condition stands in contrast to the seeds and ovules of flowering plants (angiosperms), which are enclosed within an ovary. Gymnosperm seeds develop either on the surface of scales or leaves, often modified to form cones, or at the end of short stalks as in Ginkgo. After being fertilised, the ovary starts to swell and develop into the fruit. With multi-seeded fruits, multiple grains of pollen are necessary for syngamy with
Bird food plants sour or aromatic fruits, distasteful to human beings, even better than the cultivated kinds. Many of these bird-attracting plants are ornamental as well, since many have pretty fruits, red in color and often clinging to their branches far into the winter, furnishing grateful additions to the meager fare of hard-weather birds. The many sparrows feed chiefly on weed seeds, but more acceptable plants from the gardener's point of view can be offered to them: Wild ducks are attracted by several aquatic and semi-aquatic plants, among the most important being: Bird food plants Bird food plants are certain trees, shrubs and