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Chapter 35 - Chapter 35 Plant Structure Growth and...

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Chapter 35: Plant Structure, Growth, and Development 3/17/10 Concept 35.1: The plant body has a hierarchy of organs, tissues, and cells The Three Basic Plant Organs 1. Plants draw nutrients from two very different environments: below ground and above ground 2. Three basic organs a. Roots b. Stems c. Leaves 3. Organized into the root and shoot system Figure 35.2 Clicker Question: Roots are involved in all but which of the following activities? a. Support; b. Food storage; c. food production ; d. anchorage Roots 1. An organ that anchors the vascular plant 2. Absorbs minerals and water a. Absorption occurs near root tips b. Root hairs increase the surface area of the root 3. Stores organic nutrients Figure 35.3 Stems 1. Consist of: a. Nodes—points at which leaves are attached b. Internodes—segment between nodes c. Axillary buds—potential to form lateral shoot (i.e., branch) d. Terminal bud—located at shoot tip, causes elongation of a young shoot
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Figure 35.2 Leaves 1. The leaf is the main photosynthetic organ of most vascular plants 2. Consist of: a. A flattened blade b. The petiole, which joins the leaf to a node of the stem 3. Figure 35.2’ Simple vs. Compound Leaves 1. Simple leaf: a single, undivided blade a. Some may have deep lobes 2.
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