What is gymnosperm?
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Gymnosperms (In Greek: gymnos- naked, sperma- seed) or those plants with naked or uncovered seeds or seed plants without flowers.
Gymnosperms are, those seed plants in which the seeds remain exposed over the surface of the megasporophylls because the latter are not folded to form pistils.
1) Gymnosperms are a small group of seed plants which are represented by only 900 living species.
2) Gymnosperms are more ancient than the angiosperms. They formed a dominant vegetation on earth some 200 million years back dating into the mesozoic era. Today they are dominant only in cold areas, where instead rain, snow is the source of water. At other places they have been replaced by angiosperms. In warmer areas only a handful of Gymnosperms can be observed, e.g., Cycas (like C. circinalis in Southern part of India), Araucaria (native of Southern part of America, New Zealand and East Australia, like A. heterophylla.
3) All gymnosperms are perennial and woody, forming either bushes or trees. Some of these are very large and live for thousands of years, e.g., Sequoia sempervirens (tallest gymnosperm of 111.6 meters) Zamia pygmia is smallest (26 centimeters).
4) Seeds do not occur inside a fruit. They are naked.
5) A distinction of ovary, style and stigma is absent.
Gymnosperms are, those seed plants in which the seeds remain exposed over the surface of the megasporophylls because the latter are not folded to form pistils.
1) Gymnosperms are a small group of seed plants which are represented by only 900 living species.
2) Gymnosperms are more ancient than the angiosperms. They formed a dominant vegetation on earth some 200 million years back dating into the mesozoic era. Today they are dominant only in cold areas, where instead rain, snow is the source of water. At other places they have been replaced by angiosperms. In warmer areas only a handful of Gymnosperms can be observed, e.g., Cycas (like C. circinalis in Southern part of India), Araucaria (native of Southern part of America, New Zealand and East Australia, like A. heterophylla.
3) All gymnosperms are perennial and woody, forming either bushes or trees. Some of these are very large and live for thousands of years, e.g., Sequoia sempervirens (tallest gymnosperm of 111.6 meters) Zamia pygmia is smallest (26 centimeters).
4) Seeds do not occur inside a fruit. They are naked.
5) A distinction of ovary, style and stigma is absent.
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