Feb 23 Seedless Vascular Plants Review

Feb 23 Seedless Vascular Plants Review -...

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Biol 1401 Seedless Vascular Plants Review  Ch. 21 Feb 23 rd , 2011 1. What are the modern representative groups of the seedless vascular  plants? 1) Phylum Psilotophyta 2) Phylum Lycophta 3) Phylum Equisetophyta 4) Phylum Polypodiophyta 2. What are the three major characteristics of the seedless vascular plants? 1) they do not contain trachieds or vessel cells  2) they do not contain xylem or phloem 3) they grow straight from surfaces and must have external water  to reproduce 3. Do sporophytes and gametophytes of the seedless vascular plants both  have vascular tissues?  No 4. What is lignin?- What is the importance of lignin?   Lignin adds  mechanical strength to cell walls and provides protection against  microbes 5. Is lignin hydrophilic or  hydrophobic ? How does this  hydrophobic  characteristic of lignin influence the water movement in xylem? The crosslinking of polysaccharides by ligin is an obstacle for water 
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Feb 23 Seedless Vascular Plants Review -...

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