Plant Diversity and Life Cycles. Biology 2 Chapter 29. Lycophyta- Nonvascular Plants. Plants which lack xylem and phloem, the vascular tissues which carry water and sugars to all parts of the plant. Lack true leaves, roots and stems Hornworts, liverworts and mosses. Hornworts. - PowerPoint PPT Presentation
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Plant Diversity and Life CyclesBiology 2Chapter 29
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
Hornworts
Liverworts
Mosses
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
AntheridiumThe male reproductive structures that produce
hundreds of flagellated sperm by mitosis
ArchegoniumThe female reproductive structure that produces a
single egg by mitosis
FertilizationWhen sperm unites with the egg and begins dividing
to form the zygotehaploidhaploiddiploid
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
Seedless Vascular PlantsPlants which reproduce by spores and
lack vascular tissueFerns, horsetails and whisk ferns
PterophytaFerns
Life Cycle of a FernHas alternation of generationsThe sporophyte
is the dominant formThe gametophyte is tiny and forms the
antheridia and archegonia
SoriLocated on the underside of a fern frond and contain the
sporangia where the spores are formed
