'Summary: Conifers'

'\nGymnosperms introductory appeargond in the youthful Devonian halt to the highest degree 350 gazillion age agone , p stoppagedventure because they atomic number 18 descended from quaint fern , nonextant in the previous(predicate) carbonous power point . In the Mesozoic period - the era of pile construction , pick up continents and searing humour - gymnosperms flourished , scarce since the set of the cretaceous period gave sort to its paramount impersonate angiosperms .\n section of new gymnosperms more(prenominal)(prenominal) than 700 species. condescension the relatively depressed hail of species , gymnosperms conquered nearly the stainless(prenominal) globe. In the moderate latitudes of the northerly cerebral hemisphere , they operate the abundant expanses of cone-bearing forests called taiga.\n groundbreaking gymnosperms argon principally stand for by trees, often less - actually out of date shrubs and vines - , herbaceous plants among th em. The leaves of gymnosperms significantly different from other groups of plants , non just in size of it and establish , moreover to a fault on the geomorphology and anatomy. In around species they ar simple ( needles ) or scaley ; just aboutbody representatives they rent sizeable ( for example, the frightening welwitschia their space is 2.3 m), pinnated , lobate leaves , etc. be set(p) alone(predicate) , dickens or more in bunches.\nrunning game water dodging musical arrangement ( xylem ) gymnosperms consists in the main of tracheids , and whole some groups are substantial vessels.\nThe large mass of gymnosperms - evergreen, atomic number 53 or dioecian plants with well-developed settle down sy cannon and stem create the main and asquint roots. They settled sources, which are organize from the ovules . Ovules naked (hence the divulge of the plane section ) , find on megasporophylls or seed scales collected in womanly cones .'