Lab 11 - Botany - BIOL2022wardlab.cbs.umn.edu/botany/labs/lab11.pdf · Botany Lab 11 Giant sequoia...
Transcript of Lab 11 - Botany - BIOL2022wardlab.cbs.umn.edu/botany/labs/lab11.pdf · Botany Lab 11 Giant sequoia...
BotanyLab 11
Giant sequoiaSequoiadendron giganteum
Height: 250 ftDiameter: 27 ftAge: 3,200 yrs
Today's outline
- Quiz #5- Gymnosperms (four Phyla)
- Coniferophyta- Cycadophyta- Ginkgophyta- Gnetophyta
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
(megaspore mother cell)
(nucellus)
Coniferophyta-Most are monoecious (female and maleon same plant)
Pinus
Pine leaves (needles)
Eudicot leaf
Resin duct
fascicle
-needles are usually retained for 2-3 years
Cycadophyta
coralloid roots!
- tropical / subtropical- dioecious (female and male plant)- very abundant during Mesozoic era
Gingkophyta- only living member is Ginkgo biloba- dioecious and deciduous- commonly planted in cities- female plants do not produce cones
Ovules Pollen cones
Gnetophyta
Ephedra sp. Gnetum leyboldii
Welwitschia mirabilis
- Most are dioecious