Bio Lab Wksht & HW Questions 30

Bio Lab Wksht & HW Questions 30 - In their vegetative...

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25 Chara is a distinctive, multicellular green alga found locally in fresh or brackish water. The cell walls are heavily calcified, and give these algae a gritty texture. Examine fresh or preserved material and note this characteristic. Sketch the appearance of the vegetative structure of Chara . Examine the demonstration of reproductive structures of Chara . Using the 10X objective lens, find and differentiate between the spiral-shaped oogonium and the spherical-shaped antheridium and make labeled drawings of these structures. C-6. Kingdom Amoebozoa: a. Phylum Myxogastrida (plasmodial slime molds): Members of this group play an important role as decomposers in their natural habitats, and in that respect, resemble fungal organisms. However, they are probably most closely related to the amoeboid protists. Slime molds are found in moist soil or rotting vegetation. Most are decomposers, although a few are pathogens on plants. The life cycle of a plasmodial slime mold is shown on pg. 565 of your text.
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Unformatted text preview: In their vegetative state, these organisms exist as thin, streaming masses of protoplasm, bound by a cell membrane and containing many nuclei, that move in amoeboid fashion. This stage is referred to as a plasmodium . Examine and draw living material of Physarum , a representative plasmodial slime mold. Locate the plasmodium, the central veins of protoplasm, and evidence of a slime sheath. Is this organism haploid or diploid? Where are the nuclei located? Can you see evidence of cytoplasmic streaming? When the food supply and/or water becomes limiting, the plasmodium stops moving and begins to form a series of small mounds. Each mound develops into a mature sporangium (a spore-containing sac) sitting on top of a narrow stalk (usually). The sporangium is the site of meiosis. Products of meiosis are spores. Are the spores haploid or diploid? Sketch the dried Physarum sporangia on demonstration under the dissecting microscope....
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This note was uploaded on 12/27/2011 for the course BSC 1020 taught by Professor Danmoon during the Fall '11 term at UNF.

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