chapter 34 Stems and Transport in Vascular Plants

chapter 34 Stems and Transport in Vascular Plants - Stems...

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Stems and Transport in Vascular Plants External Stem Structure in Woody Twigs · Buds- embryonic shoots on stems · Terminal bud- embryonic shoot located at the tip of the stem · Bud scales- modified leaves that protect the dormant apical meristem of the terminal bud · Axillary buds/lateral buds- located on axils of plant’s leaves · Node- area where leaf is attached · Internode- space between 2 successive nodes · Bud scale scars- result when terminal bud’s bud scales fall off as the bud resumes growing; on a twig it indicates its age · Leaf scar- shows where each leaf was attached to the stem, can determine the leaf arrangement of a stem · Bundle scars- formed by vascular tissue that extends from the stem out into the leaf, found within the leaf scar · Lenticels- bark of a woody twig has this, sites of loosely arranged cells that allow oxygen to diffuse into the interior of the woody stem, look like tiny specks on the woody twig · Primary growth- increase in the length of the plant and takes place at apical meristems located at the tips of roots and shoots and also within the buds of the stem · Secondary growth- increase in the girth of a plant and results from activity of lateral meristems located within stems and roots · Stems only with primary growth are herbaceous while stems with primary and secondary are woody Eudicot vs. Monocot · Sunflower- herbaceous eudicot
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chapter 34 Stems and Transport in Vascular Plants - Stems...

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