রবিবার, ৪ মার্চ, ২০১২

Gymnosperm leacter 1 : Characteristics of Gymnosperms



Characteristics of Gymnosperms:
  • ·        The gymnosperm is a seed-bearing vascular plant that does not bear flowers.
  • ·        The gymnosperm is either woody plant, trees, shrubs, but seldom vines.
  • ·        Many of them are very large in size.
  • ·        Gymnosperms are borne upon seed scales arranged in cones.
  • ·        Gymnosperms do not have and outer-covering or shell around their seeds.
  • ·        Gymnosperms do not produce flowers barring a few exceptions.

·        Gymnosperms are heterosporous which means that they produce different male and female spores.
·        The microspores develop into pollen grains and the megaspores are in an ovule.
·        Gymnosperms produce cones.
·        Gymnosperms do not bear fruits.
·        Gymnosperms propagate via wind pollination.
·        Gymnosperms do not have and outer-covering or shell around their seeds.
·        The male gametes are motile.
·        The pollen grains grow into pollen tubes.
·        Dichotomous venation found.
·        Germination of spores is precocious.

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