Biology 2601A/B Lecture Notes - Lecture 17: Casparian Strip, Leaf, Statocyst

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Lecture 17 water and nutrient absorption i: root structure and function. Water is pulled from soil into roots and up to leaves. Negative water potential generated at the mesophyll cell wall. As water evaporates through pores, creation of negative water potential which in turn, propagates down the xylem. Cohesion of water molecules (hydrogen bonding) transfers tension down the water column. Water is pulled up towards the site of evaporation. Root network is much more extensive than the above ground component of the plant. At the apex, root is covered in mucigel sheath which acts to protect the tip of the root: root lubricant . Quiescent center cells do not develop until needed. Region of rapid cell division where root is actively growing, pushes root downwards. Endodermis inner skin: has a casparian strip. Vascular tissue is located in the center of the root, together they are known as the stele. Meristem part of the pant that continues to divide and grow.

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