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Chapter 35 - Chapter 35 Tuesday 7:28 PM Concept 35.1 The...

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Chapter 35 Tuesday, March 20, 2007 7:28 PM Concept 35.1: The plant body has a hierarchy of organs, tissues, and cells 2 systems which are interdependent on each other: The subterranean root system and an aerial shoot system consisting of stems and leaves. Roots would starve without the shoot system and the root system depends on the absorption ability of the roots. Flowers are shoots consisting of leaves and stems highly modified for sexual reproduction The three basic plant organs Plants draw nutrients from 2 very different environments: below ground and above ground 3 basic organs a. Roots- support, food storage, anchorage b. Stems- c. Leaves- Food Production Organized into the root and shoot system Figure 35.2 Roots are involved in all but which of the following activities? 1.Support 2.Food storage 3. Food production 4.Anchorage (in root tips roots absorb minerals and water) Roots An organ that anchors the vascular plant Absorbs minerals and water Absorption occurs near root tips Root hairs increase the surface area of the roots Stores organic nutrients Figure 35.3s Monocots have fibrous root system (matted thin roots) while dicots have a taproot system (one large vertical root that produces smaller lateral roots). Root hairs increase the surface area of root Located in dermal tissue Adventitious- any plant part that grows in an atypical location Ex: Corn- the root fucion as a prop that supports the long stalk. Modified roots Figure 35.4: Strangler fig, Ceiba tree, mangroves Shoot System Consists of the stems and leaves Vegetative- leaf bearing Reproducing- flower bearing
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Stems (Shoot System) consists of: Alternating system of Nodes (points at which leaves are attached) and Internodes ( stem segment between nodes). In the angel created by each leaf and stem there are Axillary buds (potential to form lateral shoot or vegatative shoot (i.e., branch)) [potential to grow into new stems or branches] New growth is usually is at the apex where the terminal bud is located. Terminal bud- located at shoot tip, causes elongation of a young shoot. Terminal bud contributes most to the growth. Trimming the terminal buds switches growth from the tip to the lateral (Axillary buds) Figure 35.2 Modified Stems Figure 35.5 Stolons- stems grow above ground but parralel to ground, and occasionally at the node they will send up new plants. Ex: Strawberry plant Bulbs- below ground store nutrients Ex Onion Tubers-grow below ground and thickens at ends storing food.
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