chap 6 homework

chap 6 homework - rise to the epidermis. The ground...

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1. Name and discuss the structure and function of the tissue in a mature woody dicot stem, which is found between the secondary xylem and the secondary phloem. The vascular cambium lies between the secondary xylem and phloem. The cambium cells continually divide as lateral meristem and replace primary vascular tissues. The vascular cambium usually consist of two types of cells: Fusiform initials (long cells with tapered ends) and Ray initials (almost isodiametric cells - smaller and round to angular in shape). Vascular cambium is a part of the plant's meristem - series of tissues consisting of embryonic cells from which other plant tissues originates. 2. Name and discuss the structures that give rise to the primary tissues. The procambium gives rise to the primary xylem and phloem. The procambium, in plants, is a primary meristem of roots and shoots that forms the vascular tissue of primary xylem and primary phloem. The protoderm lies around the outside of the stem and gives
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Unformatted text preview: rise to the epidermis. The ground meristem gives rise to the pith and cortex. These three structures are referred to as primary meristem. 3. Compare and contrast in terms of structure, function, and position in a root and stem of: procambium, vascular cambium, cork cambium in developing roots and stems. Procambium Root produces primary xylem and phloem; interior to ground meristem; cylinder of strands Stem produces primary xylem and phloem; interior to protoderm; cylinder of strands Vascular Cambium Root develops from parts of pericycle and other parenchyma; starts producing Secondary xylem and phloem Stem lies between secondary xylem and phloem; continually divide as lateral meristem; replaces primary vascular tissues Cork Cambium Root comes from vascular cambium; cork cells are dead at maturity and full of suberin Stem comes from vascular cambium; cork cells are full of suberin...
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This note was uploaded on 03/30/2008 for the course BIO 200 taught by Professor Depar during the Fall '06 term at Dubuque.

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