BIOL 1030 Chapter Notes - Chapter 30: Conifer Cone, Pollen Tube, Megaspore

• School: University of Manitoba
• Department: Biological Sciences
• Course: BIOL 1030
• Professor: Scott Kevin

Document Summary

Chapter 30 plant diversity ii: the evolution of seed plants. Concept 30. 2 gymnosperms bear naked seeds, typically on cones: the ovules and seeds of gymnosperms ( naked seeds ) develop on the surfaces of modified leaves that usually form cones (strobili). In contrast, ovules and seeds of angiosperms develop in enclosed chambers called ovaries: the most familiar gymnosperms are the conifers, cone-bearing trees such as pine, fir, and redwood. The four phyla of extant gymnosperms are cycadophyta, Coniferophyta: the term conifer comes from the reproductive structure, the cone, which is a cluster of scalelike sporophylls, although there are only about 600 species of conifers, a few species dominate vast forested regions in the northern. Earth: redwoods from northern california can grow to heights of over. 100 m: one bristlecone pine, also from california, is more than 4,600 years old, and may be the world"s oldest living organism.