Gymnosperms

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Kingdom Plantae The Gymnosperms Objectives  By the end of the lesson you should be able to:  Compare and contrast bryophytes, pteridophytes and gymnosperms  Describe the lifecycle of a gymnosperm  Give examples of gymnosperms  When the Mesozoic era got under way, it ushered in a time of geological and climatic instability  Continental drift formed the “super continent” called Pangea  Cooler and dryer conditions put survival pressure on the water dependent non seeded vascular plants 
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  Kingdom Plantae The Gymnosperms   By the end of the lesson you should be able to:  Compare and contrast bryophytes, pteridophytes and gymnosperms  Describe the lifecycle of a gymnosperm  Give examples of gymnosperms Objectives  Evolution of Seeded Vascular Plants  When the Mesozoic era gotunder way, it ushered in atime of geological andclimatic instability  Continental drift formed the “super continent” called Pangea  Cooler and dryer conditions put survival pressure on the water dependent non seededvascular plants  The key to survival wassurviving without water   Evolution of Seeded Vascular Plants In plants, this resulted in three significant advances: 1. Gametophyte reduced even more and becomesprotected and completely dependent upon sporophyte2. Asexual spores evolved into sexual pollen for airdistribution of the gametes3. Development of an embryo protecting mechanism (seeds) that also could more effectively distribute their species
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