chapter_35_powerpoint_l

chapter_35_powerpoint_l - Plant Form Chapter 35 1 Outline...

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1 Plant Form Chapter 35
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2 2 Outline • Meristems • Organization of the Plant Body • Primary and Secondary Growth • Tissue Types – Dermal, Ground, Vascular • Roots •S t e m s • Leaves
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3 3 Meristems Meristematic tissues are clumps of small cells with dense cytoplasm and proportionately large nuclei . • They act as stem cells: One cell give rise to two cells. • They are constantly dividing, embryonic tissues responsible for both primary and secondary tissue.
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4 4 Apical Meristem : is the region of the meristem that originates the root and shoot portions of the plant. -Cell division takes place repeatedly followed by elongation of the cells by the apical meristem Lateral Meristem : is the region of the meristem that produces an increase in girth.
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5 5 Meristems Apical meristems – located at tip of stems and roots • Plant tissues that result from primary growth are called primary tissues. –make up primary plant body »young, soft shoots and roots • root apical meristem protected by root cap
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6 6 This diagram delineates the areas that make up the tip of a stem.
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7 7
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8 8 Apical Meristems Give rise to three types of primary meristems protoderm - forms epidermis procambium - forms primary vascular tissue ground meristem - differentiates into ground tissue intercalary meristems may arise in stem internodes
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9 9
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10 10 Lateral Meristems • Most trees, shrubs, and some herbs have active lateral meristems. – increases girth in nonwoody plants - secondary growth • Woody stems – cork cambium • produces cork cells – vascular cambium • produces secondary vascular tissue
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11 11
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12 12 Organization of the Plant Body • Vascular plant consists of: root system - anchors plant and penetrates soil to absorb water and ions shoot system stems – framework for positioning leaves leaves - principle sites of photosynthesis –vegetative shoot - internode, node leaf and axillary buds
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13 13 Plant Body Diagram
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14 Organization of the Plant Body • Tissue types (each tissue is cell specific) ground tissue - parenchyma cells dermal tissue - outer covering epidermis in plants limited to primary growth –cuticle bark in secondary growth plants vascular tissue - conduction xylem - water and dissolved materials phloem – carbohydrates (sucrose), hormones, amino acids, etc.
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This note was uploaded on 08/03/2010 for the course BIO 1500 taught by Professor Pandolfi during the Fall '08 term at Wayne State University.

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chapter_35_powerpoint_l - Plant Form Chapter 35 1 Outline...

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