ROOTS - 1. Epidermis a. root hairs b. thin cuticle 2....

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ROOTS 3. B. Fibrous Root System 1. roots arise from stem base 2. shallow root system 3. monocots C. Adventitious Root System II. FUNCTION OF ROOTS A. Anchorage B. Storage C. Absorption D. Conduction 1
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III. ROOT STRUCTURE - Primary Growth A. The Root Cap 1. Parenchyma cells covering root tip. 2. Protect root tip. 3. Golgi bodies secrete mucilages that lubricate growing root. 4. Function in gravitropism. a. amyloplasts may influence growth hormones. B. The Region of Cell Division 1. Apical Meristem a. cube-shaped cells b. centrally located nuclei c. few or no vacuoles d. undifferentiated cells that give rise to other meristems. 2. Protoderm a. produces epidermis 3. Ground meristem a. produces parenchyma cells of cortex 4. Procambium a. primary xylem b. primary phloem 3
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c. pith (absent in most dicots but found in many monocots). C. The Region of Elongation 1. Cells become several times longer but not much wider. 2. One or two large vacuoles form (90 % of cell volume). D. The Region of Maturation or Differentiation
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Unformatted text preview: 1. Epidermis a. root hairs b. thin cuticle 2. Cortex a. parenchyma cells 4 b. storage 3. Endodermis a. single layer of cells. b. form suberized band called Casparian strip c. forces water and minerals to enter cells d. enables the root to be selective 4. Pericycle a. one to a few cells wide. b. cells remain meristematic c. produces lateral roots. d. produces vascular cambium (secondary growth tissue) in dicots 5. Primary Xylem 6. Primary Phloem 5 7. 6 IV. ROOT STRUCTURE - Secondary Growth in Woody Plants A. Cork Cambium 1. from pericycle 2. produces cork tissue (periderm) 3. similar to bark B. Vascular Cambium 1. secondary xylem 2. secondary phloem 7 V. SPECIALIZED ROOTS: A. Food Storage B. Water Storage C. Propagative D. Pneumatophores E. Aerial F. Contractile G. Buttress H. Parasitic I. Mycorrhizae J. Root nodules VI. HUMAN RELEVANCE OF ROOTS: A. Food B. Erosion C. Medicine 8...
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ROOTS - 1. Epidermis a. root hairs b. thin cuticle 2....

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