BIOL 102 Lecture Notes - Lecture 17: Nitrogen Fixation, Decomposer, Guttation

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22 Feb 2017
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Transport of water, minerals, and food in most plants is achieved by using the vascular tissues. Two vascular tissues: 1) xylem carries water & minerals (xylem sap: water transport. Water and mineral transport in vascular plants is explained by the cohesion tension mechanism. Tension is due to the pull of transpiration that occurs through stomata: phloem carries sugars and other organic compounds (phloem sap) Transpiration is the evaporation of water from the surface of plants (through the stomata) Cohesion refers to the stickiness of water; water molecules stick to each other and other polar molecules by way of hydrogen bonds. If water wasn"t cohesive, a column of water molecules would not be maintained in the xylem vessels. Note: the xylem cells are dead at maturity. By opening and closing the guard cells, the plant has some control over the rate of transpiration.

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