BIOL1401- Stems

BIOL1401- Stems - Chapter 6 Stems Outline...

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Chapter 6 Stems
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Outline External Form of a Woody Twig Origin and Development of Stems Tissue Patterns in Stems Herbaceous Dicotyledonous Stems Woody Dicotyledonous Stems Monocotyledonous Stems Specialized Stems
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External Form of A Woody Twig Cells produced by stem meristem become  shoot system  with   branches and leaves. Woody twig consists of an axis with  attached leaves. Node  - Area of stem where leaves  are attached Internode  - Stem region between  nodes Leaf has a flattened  blade  and is  usually attached to the twig by  petiole .
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External Form of A Woody Twig Axillary Bud  located in axil. Will become branches or flowers  in flowering plants Terminal Bud  at twig tip.  Growth makes twig longer.
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External Form of A Woody Twig Deciduous  trees and shrubs  (lose all leaves annually) -  After leaves fall, have  dormant axillary buds with  leaf scars below Bundle scars  mark food and  water conducting tissue within  leaf scars.
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Leaf Arrangement on Stem Alternate  or  spiral Opposite  - Attached in  pairs Whorled  - In groups of  three or more Whorled Opposite
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Origin and Development of Stems Apical meristem  at stem tip Contributes to increase in stem  length Dormant before growing season  begins Protected by bud scales and by  leaf primordia Leaf primordia  - Tiny embryonic  leaves that develop into mature  leaves Longitudinal section through  stem tip
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BIOL1401- Stems - Chapter 6 Stems Outline...

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