Vascular plants with unprotected seeds

Vascular plants with unprotected seeds - Vascular plants...

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Unformatted text preview: Vascular plants with unprotected seeds (gymnosperms) The vascular plants having naked seeds are known as gymnosperms. Their seeds are not enclosed in female tissues and are therefore said to be naked. There are four divisions of gymnosperms: Cycadophyta (Cycads), Ginkgophyta (Ginkgo), Gnetophyta (Gnetae), and Coniferophyta (Conifer). Coniferophyta is the largest and most familiar division of the gymnosperms. These plants are cone- bearers and are therefore called conifers . The seeds are borne on the surface of the female cone scales. Members of this division include trees such as cedars, firs, spruces, pines, and giant redwoods. The leaves are generally needle-shaped and contain vascular tissue. The full-grown conifer (for example, a pine tree) is the sporophyte generation of the plant. The sporophyte produces male and female cones on the same tree. These cones produce spores that sporophyte produces male and female cones on the same tree....
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This note was uploaded on 11/11/2011 for the course BIO 101 taught by Professor Pesthy during the Fall '07 term at Texas State.

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