Plant Diversity and Life Cycles
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Transcript of Plant Diversity and Life Cycles
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Plant Diversity and Life CyclesBiology 2Chapter 29
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Lycophyta-Nonvascular PlantsPlants which lack xylem and phloem, the vascular tissues which carry water and sugars to all parts of the plant.Lack true leaves, roots and stemsHornworts, liverworts and mosses
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Hornworts
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Liverworts
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Mosses
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Life Cycle of MossesThe dominant form of a moss is a clump of leafy green gametophytes which produces the sperm and the eggHave alternation of generationsThe alternate form is called the sporophyte and produces the spores
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AntheridiumThe male reproductive structures that produce hundreds of flagellated sperm by mitosis
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ArchegoniumThe female reproductive structure that produces a single egg by mitosis
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FertilizationWhen sperm unites with the egg and begins dividing to form the zygotehaploidhaploiddiploid
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SporophyteGrows from the tip of a gametophyte and remains attached to itForms the spores by meiosis which are released and grow to produce the gametophyte
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Seedless Vascular PlantsPlants which reproduce by spores and lack vascular tissueFerns, horsetails and whisk ferns
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PterophytaFerns
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Life Cycle of a FernHas alternation of generationsThe sporophyte is the dominant formThe gametophyte is tiny and forms the antheridia and archegonia
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SoriLocated on the underside of a fern frond and contain the sporangia where the spores are formed
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SphenophytaHorsetails, Equisetum Equisetum
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PsilophytaWhisk ferns