lab 11 - botany - biol2022wardlab.cbs.umn.edu/botany/labs/lab11.pdf · botany lab 11 giant sequoia...
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BotanyLab 11
Giant sequoiaSequoiadendron giganteum
Height: 250 ftDiameter: 27 ftAge: 3,200 yrs
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Today's outline
- Quiz #5- Gymnosperms (four Phyla)
- Coniferophyta- Cycadophyta- Ginkgophyta- Gnetophyta
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Gymnosperm Reproduction
- all seed plants are heterosporous! (we call the males microspores and the females megaspores)- produce naked seeds - gametophytes are nutritionally dependent on sporophytes- water not needed for fertilization
microspores
naked seeds
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(megaspore mother cell)
(nucellus)
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Coniferophyta-Most are monoecious (female and maleon same plant)
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Pinus
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Pine leaves (needles)
Eudicot leaf
Resin duct
fascicle
-needles are usually retained for 2-3 years
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Cycadophyta
coralloid roots!
- tropical / subtropical- dioecious (female and male plant)- very abundant during Mesozoic era
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Gingkophyta- only living member is Ginkgo biloba- dioecious and deciduous- commonly planted in cities- female plants do not produce cones
Ovules Pollen cones
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Gnetophyta
Ephedra sp. Gnetum leyboldii
Welwitschia mirabilis
- Most are dioecious