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Botany Exam 4, Perianth, megasporangium=nucellus, Carpel- holds ovule -…
Botany Exam 4
Seeds
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Megaspore/Megasporocyte
1 megaspore
undergoes mitosis to form megagametophyte, which is parasitic to the sporocyte.
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Flowers
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Perfect flowers
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Have all 4 appendages
Sepals
Modified leaves, outermost appendage
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Stamens, male (microsporophyll)
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Carpels, female (megasporophyll)
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Imperfect flowers
Monoecious = male flowers and female flowers on the same plant #
Dioecious = male flowers on plant, female flowers on different plant
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Pollination
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Myophily, sapromyophily (fly)
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Seeds
Angiosperms
Double fertilization
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One sperm fuses with egg, becomes embryo
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Gymnosperms
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Integument becomes seed coat #
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Microgametophyte
multicelular, haploid
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early
begin as flagellated, have to swim
land in pollen chamber, form tubes called haustoria, feed on nucellus
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