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23 Cards in this Set
- Front
- Back
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What does gymnosperm mean?
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bears naked seeds
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what are the 4 groups of gymnosperms that live today and their common names.
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cycadophyta (cycads)
Ginkgophyta (Ginkgo) Gnetophyta (Gnetum, Wlwitschia and Ephedra) Coniferophyta (conifers) |
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Which groups of gymnosperms have motile sperm?
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Ginkgophyta and Cycadophyta
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What is pollen?
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the microgametophyte is discharged from the sporangium before it is fully mature
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What is pollination?
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pollen is carried (usually by wind) to an area near the megagametophyte
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What is fertilization?
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one sperm nucleus unites with an egg in the archegonium
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What is an ovule?
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megagametophyte in the sporangium
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What is a seed?
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fertilized megagametophyte (mature ovule)
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What are the parts of a seed?
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megagametophyte w/ the egg cell, surrounded by the nucellus and one or two integuments
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What does dioecious mean?
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male and female reproductive organs borne on separate individuals
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Which gymnosperms are dioecious?
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Cycadophyta and Ginkgophyta
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What is an example of a cycad and a ginkgo?
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cycad- zamia
ginkgo- ginkgo |
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What is the nucellus?
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the megasporangium
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What is the micropyle?
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an opening of the integuments around a seed to allow pollen grains in
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What are microsporangiate?
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pollen cones
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What are conifers characterized by?
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the production of cones
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give some examples of Confifers.
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yews, junipers, pines, redwoods, firs, spruces, hemlocks
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How are and gnetophyta confiers pollinated?
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by wind
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What is a fascicle?
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a bundle of needles
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What are cones?
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strobili
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Where are the microsporangiate and the megasporangiate located on a tree? what are these types of cones.
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mega- upper - ovulate cones
micro-lower branches-pollen producing cones |
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What are microsporocytes?
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microspore mother cells that produces four haploid microspores
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What is a pollen grain?
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immature microgametophyte
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