01:119:116 Lecture Notes - Lecture 10: Apoptosis, Germination, Phototropism
15 Mar 2017
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Document Summary
Systems are comprised of cells, tissues, organs, systems. Functions: anchors, absorbs- water, storage of sugar. Root hairs -> root hairs are where water enters. Functions: support leaves, transport of sugar/water, height. Functions: defense, guard cells open/close stomata trichromes - spiky insect defense, water absorption at root hairs. Functions: comprise most of plant, pith and cortex, cells specialized for: photosynthesis, support, short distance, (cell to cell) transport. Functions: transports, water, sugar, hormones, minerals, some structural supports, xylem - h2o & minerals up. Water evaporates from leaves and draws water up from roots. Sun rises-> photosynthesis occurs -> stomata open -> transpiration. Allows unbroken water column to form and adhere to xylem walls. Adhesion: h2o sticks to other things with h-bonds. Pressure-flow hypothesis- pressure gradient exists between source where sugar is loaded into phloem (high pressure) and sink where sugar is removed from phloem (low p)
