BIO 123 Lecture 2: lecture2

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Vertical stem that bears leaves (main photosynthesis organs) Xylem complex tissue, conducts water and dissolved minerals. Conducting cells of xylem: tracheids and vessel elements. Question : in many woody dicots, the functional xylem is composed of 1. dead cells 2. Dermal tissue system outer protective covering of plant body. Conducting cells of phloem: sieve tube elements, assisted by companion cells. Waxy cuticle: reduces water loss, secreted by epidermis covering aerial parts. Trade off between carbon dioxide and water requirements. Loss of leaves, as winter approaches in temperate climates. At the beginning of dry period in tropical climates with wet and dry seasons. Close at night to conserve water when photosynthesis is not occuring. Except for in cam plants, usually in arid environments, then, stomata open during the night. Water and dissolved minerals move from soil into root i=tissues. Explains rise of water, even in tallest plants. Evaporative pull causes tension at top of plant.

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