Similarities and Differences between Bryophytes and Vascular Plants and other things
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all develop from embryos within the female gametangium
Bryophytes: no vascular tissue, except for simple water-conducting cells or sugar-transporting cells in some mosses
Vascular Plants: xylem and phloem present
Bryophtes: no roots; have rhizoids (mostly parenchyma tissue) as anchoring and absorbing structures); no true stems and leaves
Vascular Plants: true roots; stems and leaves
Dominance of generation
Gametangia and Sporangia
Bryophytes: gametophyte dominant; sporophyte dependent on the gametophyte
Vascular: sporophyte dominant; ultimately independent of the gametophyte
Both spore walls contain sporollenin
Both have gametangia and sporangia that are multicellular and protected by a jacket of sterile cells
Explain the antheridium of a bryophyte.
all cells to the inside of the sterile outer layer of cells are capable of producing sperm
sterile cells cannot
Explain the archegonium of the bryophytes.
has a neck and a sterile layer of cells
The venter is below the neck
the whole structure produces just one egg
What does the sporangial head contain?
Sphanum: Phylum __
Portion of a "Leaf": What are the parts?
- hyaline cell
- vegetative cell
Explain the life cycle (asexual) of Marchantia, a Liverwort
gametophyte has gemmae cups which contain and produce gemmae which develop into the gametophyte
Sexual Life cycle of Marchantia
Gametophyte--> a and b
a: female thallus with archegoniophores forms--> archegonium which produces one egg
b: male thallus with antheridiophores forms--> antheridium--> produces sperm
egg and sperm fuse--> fertilization (2n)--> zygote--> meiosis--> sporophyte--> spore release--> spores--> gametophyte
Where is the antheridia located in Marchantia? archegonia?
- antheridia: top part as scallops
- archegonia are located downward up top
What does an archegonium consist of?
What does a sporophyte consist of? in Liverwort
- sporangium (2n jacket)
- elaters (2n)
- seta 2n
- foot 2n
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