Gymnosperms | Seed Plants | Unit 5. Biological Diversity
Chapter: Gymnosperms
Collection: Seed Plants
Unit 5. Biological Diversity
Book: Biology
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Gymnosperms are heterosporous seed plants that produce naked seeds. They appeared in the Paleozoic period and were the dominant plant life during the Mesozoic. Modern-day gymnosperms belong to four phyla. The largest phylum, Coniferophyta, is represented by conifers, the predominant plants at high altitude and latitude. Cycads (phylum Cycadophyta) resemble palm trees and grow in tropical climates. 'Gingko biloba' is the only representative of the phylum Gingkophyta. The last phylum, Gnetophyta, is a diverse group of shrubs that produce vessel elements in their wood.
00:00 Gymnosperms
02:39 Life cycle of a conifer
05:17 Diversity of gymnosperms
05:54 Conifers (coniferophyta)
07:10 Cycads
07:55 Gingkophytes
08:42 Gnetophytes
09:39 Section summary
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