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Seed Plants
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Three Main Traits
1. Heterosporons Spore Production
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Seed Plants-angio&gy

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Seed Plants Angiosperm - enclosed (flowering plants) & Gymnosperm - Naked Seed (conifers, pines)
Three Main Traits 1. Heterosporons Spore Production Two spore types - Micro (male) Macro (female) Produce Dioecious gametophytes (unisexual)
A. Microsporangia (gymno - male cone; angio - anther) Microsporocyte(s)(2N)->meiosis-> microspores (N) Microspore(N)->mitosis->micro - Gametophyte(N) Pollen(dependent on parent sporophyte
B. Megasporangium - One (within ovule)(Gymno - female cone; Carpel - Angio) ONE Megasporocyte per ovule -> meiosis -> 4 Megaspores (N) per ovule 3 degenerate 1 surviving Megaspore -> mitosis -> Megagametophyte per ovule Dependent on parent sporophyte
2. Ovule/Seed (fertilization) A. Mature Ovule Gymnosperm vs Angiosperm refer to DIAGRAM #25 Gymno - archegonia, single fertilization (2-6) Angio - NO archegonia, double fertilization(2 sperm), (7 cells (N) 8 nuclei) REFER TO DIAGRAM #25
B. Mature Seed Gymnosperm vs Angiosperm Gymno - multiple cotyledon, female gametophyte(N) Angio - cotyledon(1-2), endosperm (3N)
Endosperm (3N) nutrient tissue stored, product of double fertilization
Cotyledon The one (monocot) or two (dicot) seed leaves of an angiosperm embryo.
C. Final Gymnosperm vs Angiosperm Gymno - Zygote(N), single fertilization(1 sperm) Angio - Zygote(2N), double fertilization(2 sperm), endosperm(3N)
Created by: umcer
 

 



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