Transpiration In Plants

Check us out at www.tutorvista.com Transpiration is a process similar to evaporation. It is the loss of water from parts of plants (similar to sweating), especially in leaves but also in stems, flowers and roots. Leaf surfaces are dotted with openings called, collectively, stomata, and in most plants they are more numerous on the undersides of the foliage. The stoma are bordered by guard cells that open and close the pore. Leaf transpiration occurs through stomata, and can be thought of as a necessary “cost” associated with the opening of the stomata to allow the diffusion of carbon dioxide gas from the air for photosynthesis. Transpiration also cools plants and enables mass flow of mineral nutrients and water from roots to shoots. Mass flow of liquid water from the roots to the leaves is caused by the decrease in hydrostatic (water) pressure in the upper parts of the plants due to the diffusion of water out of stomata into the atmosphere. Water is absorbed at the roots by osmosis, and any dissolved mineral nutrients travel with it through the xylem. The rate of transpiration is directly related to the degree of stomatal opening, and to the evaporative demand of the atmosphere surrounding the leaf. The amount of water lost by a plant depends on its size, along with surrounding light intensity, temperature, humidity, and wind speed (all of which influence evaporative demand). Soil water supply and soil temperature can influence stomatal opening, and thus transpiration rate
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24 thoughts on “Transpiration In Plants”

  1. thank you for the vids. i finally understand stuff that were harder to get when it was just the professor talking about them in front of us

  2. Very clear video – but there are always exceptions to the rule there are other plant systems like Cam cycles and some plants can move as in Lloyd Godman’s Atmocycle

  3. Whatever the source of pressure,recent research indicates that tree size is limited by the power required to carry water to the treetop.Resistance caused by friction in increases as the length of the xylem increases,causing a reduction in water pressure in higher tree elevations.Cavitation,or the formation of air bubbles in vessels,happens more frequently as pressure decreases,and since cavitation breaks water molecule bonds,it has a disastrous effect on transportation through the xylem.

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