Unformatted text preview: Lecture 2/9 Seed Plants I Pine Life-cycle: shared features among seed plants Growth Megasporocyte Megasporangium Sporophyte (about 10100 m) Immature cone Strobili Meiosis Ovule Meiosis Scale of strobilus Section through scale Microspores HAPLOID (n) Gametophyte generation Egg Sperm Wing Seed Scale of cone Developing embryos Functional megaspore Pine Life Cycle: No antheridia!!
Pollen grain Pollen grain Seed coat Female gametophyte Embryo DIPLOID (2n) Sporophyte generation Winged seed Female gametophyte Archegonium Male gametophyte (germinating pollen grain) Fertilization Zygote Mature cone Animation 29.1 Life Cycle of a Conifer
Animation-28-01.swf The Gymnosperm life cycle represents an extreme form of heterospory. A. True B. False Lecture 2/9 Seed Plants I Pine Life-cycle: shared features among seed plants Growth ...
View Full Document
This document was uploaded on 04/02/2009.
- Winter '08