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Alternation of Generations
Two alternating multicellular stages
- Diploid Sporophyte generation
- Haploid Gametophyte Generation
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Gametangium
In the earliest evolving groups of land plants gametes were produced inside a protective covereing......
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Cuticle
aerial body parts, waxy, prevents water loss
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Pollen
sperm that no longer needed water to swim to the egg
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Seed
when fertilized the zygote and surrounding tissue developed into the seed
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Multicellular
consisting of many specilized cells that perform only certian functions
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Gametangia
reprodictive organs surrounded by nonreproductive cells that protect the gametes as they develop
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Oogamy
the production of two different types of gametes, one smaller and motile and the other larger and immotile
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Sporopollenin
waterproofing compound fouind in the walls of plant spores and pollen
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Plasmodesmata
small strands of cytoplasm connecting adjacent cells
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internodal cell
long internodal areas that consists of one internodal cell
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nodal cells
diovision of nodla cells give rise to the whorls of leaflike laterals at each node
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laterals
whorls, leaflike
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antheridia
Male gametangia
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thallus
the body of individual plants, moss
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Rhizoids
adaptation for anchorage and thier surface area allows water and mineral absorption
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Gemme cups
- on the upper surface of the thallus
- produce asexual gemmae
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Gemmae
small multicellular discs of green tissue
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antheridia
seperate male parts that bear gametangia
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archegonia
female plants, gametangia
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neck canal
extending from the egg where the sperm must swim
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sporangium
- capsule
- sporocytes
- elaters
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protonema
halpoid moss cells divide by mitosis to produce haploid protonema
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Tahlli (sing. thallus)
small heart shaped leaflike structures that are the begining of a fern.
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