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PLANT VARIETY-GYMNOSPERMS

THE  GYMNOSPERMS  ARE  FOUR  RELATED  PHYLA  of  seed  producing   plants;their  seeds, however, lack  the  protective,outer covering   which   surrounds   the   seeds  of  flowering   plants .Typically ,  gymnosperms  are    woody  , perennial   shrubs  or  trees,  with  stems ,leaves,and  roots and  a  well  developed    vascular(transport )  system.
The   reproductive  structures  in  most  gymnosperms  are  cones;male  cones  produce   micro-spores  in  which  male  gametes (sex cells)develop,female  cones   produce  megaspores   in  which  female  gametes   develop.Microspores   are   blown  by  the  wind   to  female  cones ,male  and  female  gametes  fuse    during  fertilization  and  a   seed  develops.
The    four  gymnosperm  phyla    are   the   conifers,(phylum coniferophyta),  mostly  tall   trees;cycads(phylum  cycadophyta), small  palm  like trees,;the  ginkgo or    maidenhair  tree(phylum Gnetophyta),  a  diverse   group  of  plants ,  mainly  shrubs ,  but also  including  horizontally  growing   welwitschia.

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