This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: & m archegoniu w/ leaf big into grows es gametophyt into grow spores release meiosis Sporangium mitosis → → → → → → • First group to evolve: o Megaphyll – big leaf and o Sporophyll – spore-producing structur • Annulus – ridge of cells along sporangium (has really thick cell walls). They disperse the spores by shrinking when it gets dry. • Hermaphroditic – Has both sexual organs on the same plant • Archegonium and Antheridium develop at different time in order to avoid self-fertilization Life Cycle of a Pine • produces two types of cones: ovulate and pollen cones • both are proguced in sporangia • megasporangium produces • spores are multicellular and made up of 4 cells o prothallial cells don’t do anything o the other two…...
View Full Document
- Fall '07
- Plants, Fern, Spore, Gametophyte, archegonium, antheridium fertilization zygote