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INVASION OF LAND
• Sporophyte is fed by protective gametophytic tissue- serves as a protection
for the sporophyte
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Begin to see equisetum and angiosperms as the diploid form
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• Spermatophyte- the seed is crucial for the ability of the organism to survive
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Get
microspores- male and megaspores- egg
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In the
archegonia get the meiotic process occurring - get development of
multicellular gametophyte never leaves- always protected
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get zygote embryo multicellular
surrounded by a seed coat which is provided by the parental sporophyte
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Crucial in terms of how these
organisms have been successful in the invasion of land
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Seed trait of gymnosperm have been around
for 350 million years
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• Ferns have retained dominant state
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Angiosperm beats all of em in dominance
• Bryophytes- have around 22,400 species
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Gymnosperms seeded- 750
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Dominance
is partially in context of species- abundance - maximal coverage on land
of the above mentioned species
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Darwin described this explosion of species as an
abominable mystery
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The flowers, trees , birds and bees- speciation event
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Gametophyte is
relatively small- represents only 8 cells- megagametogenesis
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microspore lands, germinates- no
motile spore
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Insects carry pollen and allows for fertilization to occur between two different
species
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Solidago- Goldenrod- insect pollinated - multiple flowers associated with it
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Below- male structure
(anther- 2 loci in which the pollen exists in and is released) Disperses a
mega quantity of spores- wind pollinated
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Stigmatic structure
associated with the carpel
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