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
Botanical Garden named after Rostovtsev and a botanical garden was headed by Professor V. G. Khrzhanovsky. When it was built a greenhouse for subtropical plants. At present, on the basis of the botanical garden, summer scientific research and production practice is conducted. Students study there ways of plant reproduction, morphogenesis, as well as technologies of landscape design. Periodically free excursions are organized for all comers. In the botanical garden there are landscapes, ornamental and experimental sites, as well as a greenhouse with an area of about 400 m². According to data for 2012, in the botanical garden there are about 600 species and forms of