BIOL 2200 Chapter 35: Textbook Notes Plant Growth and Reproduction
1 Apr 2017
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35. 1 plants have a hierarchal organization consisting of organs, tissues and cells. Three basic plant organs: roots, stems and leaves: form a root and shoot system. Primary root dies early, taproot doesn"t form, and instead many small roots emerge from stem. Found with many grasses: root hairs thin finger-like extensions of root epidermal cells, where absorption of water and minerals primarily takes place, form mycorrhizal associations with fungi. Leaves: main photosynthetic organ, gas exchange, contains flattened blade and stalk (petiole) which connects leaf to the stem at a node, monocots vs. eudicots. Dermal, vascular and ground tissue systems: dermal tissue system outer protective covering. Nonwoody plants single tissue called epidermis. Cuticle waxy, epidermal coating that helps prevent water loss. Guard cells are special epidermal cells specialized for gas exchange: vascular tissue system. Stele vascular tissue of root or stem: ground tissue system. Also supporting elements, but more rigid than collenchyma cells. Dead at maturity and function as skeleton.
