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Old 03-18-2008, 12:45 PM
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biology! this sucks. i need help MACHO much. haha thank you.?

What characteristics are common among non-vascular plants? Name at least three.
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Old 03-18-2008, 12:46 PM
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1. do
2. your
3. homework
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Old 03-18-2008, 12:47 PM
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Read the book you lazy piece of crap.
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Old 03-18-2008, 12:49 PM
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1. possess tissues specialized for internal transport of water.

2. have no roots, stems, or leaves, since each of these structures is defined by containing vascular tissue.

3. not true leaves because they have no xylem or phloem.
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Old 03-18-2008, 12:50 PM
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Nonvascular plants are the simplest of all land dwelling plants. Like their closest ancestors, the green algae, they lack an internal means for water transportation. They also do not produce seeds or flowers. They generally only reach a height of one to two centimeters, because they lack the woody tissue necessary for support on land.
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Old 03-18-2008, 12:50 PM
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* Homologous chloroplasts - Both nonvascular plants and charophytes use chlorophyll and beta carotene as accessory pigments in their chloroplasts. Also, the thylakoid membranes of both are stacked as grana.
* Biochemical Similarities - Charophytes and plants both have cellulose in their cell walls, and their peroxisomes have the same enzyme composition.
* Similarities in the mechanisms of mitosis and cytokinesis - During mitosis in both nonvascular plants and charophytes, the nuclear envelope completely disperses during late prophase. In cytokinesis, the formation of a cell plate involves the cooperation of microtubules, actin microfilaments, and vesicles.
* Similarity in sperm ultrastructure - In the details of sperm ultrastructure, charophytes are more similar to plants than to other green algae.
* Genetic relationship - Nonvascular plant nuclear genes and ribosomal RNA most closely resemble those of charophytes.
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