BIO 201 Lecture Notes - Lecture 20: C3 Carbon Fixation, Carbon Fixation, Light-Dependent Reactions
20 Apr 2016
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Sugar production and plant transport: making and moving food and water. Understand the processes by which water is transported from the soil to the top of the plant via xylem. Understand how solutes/sugars are made and transported through the phloem. 2 models of transportation in plants: transpiration-cohesion-tension (tct) model: Explain how water is transported through plan xylem: pressure flow model: Explains how food is translocated in the phloem. What phenomena is the transpiration, cohesion, tension (tct) model attempting to explain. It takes energy to change water from liquid to vapor. Heat loss from sweating can be around . 6 kcals for every ml of water evaporated. Body heat is used to change water from a liquid to a vapor. Energy is needed to move water from a liquid to a vapor. Leaf and stem epidermis has a waxy cuticle to minimize water loss, but it also prevents gas exchange.
