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15 Cards in this Set
- Front
- Back
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Name some nonvascular plants? |
liverworts, hornworts, moss -plants without a vascular system (xylem and phloem). Although non-vascular plants lack these particular tissues, many possess simpler tissues that are specialized for internal transport of water. |
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describe the alternation of generations in non-vascular plants |
All land plants have a life cycle with an alternation of generations between a diploid sporophyte and a haploid gametophyte, but in all non-vascular land plants the gametophyte generation is dominant. In these plants, the sporophytes grow from and are dependent on gametophytes for taking in water and mineral nutrients and for provision of photosynthate, the products of photosynthesis. |
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Vascular plants are collectively known as ? |
bryophytes |
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what are pteridophytes? |
are vascular plants (plants with xylem and phloem) that reproduce and disperse via spores. -The group includes ferns, horsetails, clubmosses, spikemosses and quillworts. |
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why are pteridophytes sometimes referred to as cryptograms? |
because they produce no flowers or seeds. |
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why aren't they considered to be monophyletic group? |
because ferns and horsetails are more closely related to seed plants than to lycophytes (clubmosses, spikemosses and quillworts). Therefore, pteridophytes are no longer considered to form a valid taxon, but the term is still used as an informal way to refer to ferns (monilophytes) and lycophytes, and some recent authors have used the term to refer strictly to the monilophytes. |
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which of the mosses are pteridophytes? |
just the club moss |
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what is the economic use for club moss? |
they were used in early photography for flash |
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are the remainder of moss bryophytes? |
yes |
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are pteridophytes vascular? |
yes |
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what is a commonality between pteridophytes and bryophytes? |
they are homosporous |
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what does homosporous mean? |
the sporophyte only produces one kind of spore but the sexual differentiation occurs in gametophyte stage |
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what is the dominant generation in bryophytes? |
gametophyte stage |
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what is the dominant generation in pteridophytes? |
sporophytes |
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which of the bryophytes has the most human economic value? |
peat moss (spagnum) -used for heating, soil amendments, absorbs lots of water, can increase water levels in an area |
