Exam 3: Bryophytes Overview
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Bryophytes contribute significantly to what?
the carbon cycle
Similarities of bryophytes with green algae?
- both have chloroplasts
- asymmetrical motile cells with flagella that extend from the side and not the back
- breakdown of nuclear envelope at mitosis
Differences of green algae with bryophytes
- 1) bryophytes have antheridia and archegonia with a protective layer of sterile cells
- 2) retention of both the zygote and embryo in archegonium
- 3) multicellular diploid sporophyte
- 4) multicellular sporangia with spore-producing tissue
- 5) meiospores with walls with sporopollenin
- 6) tissues produced by apical meristem
What do living bryophytes lack?
water and food conducting vascular tissues called xylem and phloem
Difference between bryophytes and vascular plants.
bryophytes: gametophyte is the dominant stage
vascular plants: sporophyte dominates
What are thalli/
undifferentiated bodies (not differentiated into roots, leaves, and stems)
True or False:
bryophytes show no sense of conduction at all.
false; some thalli have a central strand of cells that are conducting
What are ways that bryophytes can get food and water since they have no roots?
- rhizoids anchor but special hairs aid in water transport and absorption by leaves and stems
- bryophytes can have symbionts to aid in mineral absorption
The __ is commonly stalked and consists of a __, one cell thick, that surrrounds numerous __, cells that develop into sperm cells
- spherical or elongated antheridium
- sterile jacket layer
- spermatogenous cells
Explain the structure of bryophyte archegonia
flask-shaped, with a long neck and a swollen basal portion (the venter), which encloses ONE egg
outer layyer of neck and venter forms sterile protective layer of the archegonium
central cells of the neck (neck canal cells( disintegrate when the egg is mature, resultinign in a fluid-filled tube, through wihich the sperm swim to the gg
chemicals released that attract sperm
Explain what happens with the archegonia after formation of the embryo.
as teh embro develops, the venter's cells divide; and the enlarged venter is the calyptra
Explain the bryophyte sporophyte.
consists of a foot, which remains embedded in the archegonium, a seta, or stalk, and a capsule, or sporangium
What is the advantage of matrotrophy (mother supplies all the nutrients)?
they fuel the production of a many-celled diploid sporophyte, each cell of which is genetically equivalent ot hte fertilized egg, the cells of which can be used to produce many different haploid spores upon meiosis of the sporangium
The sporophyte epidermis of mosses and many hornworts contains __-- each bordered by two guard cells--that are similar to those of vascular plants.
Explain the differences betwen the two.
moss: open and close thus regulating gas exchange
hornwort: once open, they remain open; can't close
liverworts dont have any
bryophyte spores germinate to form juvenile developmental stages, which in mosses are called __. From the __, __ and __ develop. These are characteristic of __ and some __, but not __
- mosses and liverworts
Explain the annulus
special layer of unevenly thick-walled cells called an annulus
as the sporangium dries out, contraction of the annulus causes tearing in the middle of the capsule
the sudden explosion and snapping back of the annulus to its original position then results in a catapult-like discharge of the spores
What are the parts of the fern sporophyte?
the leaves (fronds), which acn be divided into pinnae, whichh are attached to rachis, an extension of the leaf stalk (petiole)
young leaves are coiled adn called fiddleheads
sori on the backside
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