Transpiration In Plants

Check us out at 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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Comments ( 24 )
  1. afsheen70
    February 4, 2013 at 11:30 pm


  2. Saba Khan
    February 4, 2013 at 11:45 pm

    his voice…

  3. Bhavik Patel
    February 5, 2013 at 12:13 am

    This is amazing 😀

  4. RacistSasori
    February 5, 2013 at 12:41 am

    Thanks very much mysterious Indian AI.

  5. Monika Kw
    February 5, 2013 at 1:06 am

    hey great video i liked the simple and clear explanation good job

  6. Eunice Cheung
    February 5, 2013 at 1:44 am

    is this form India?

  7. Ororo Munroe
    February 5, 2013 at 2:06 am

    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

  8. BigaznPARK
    February 5, 2013 at 2:36 am

    notice how the bottom left says “endurite” this tutorvista sucks and stole videos from other sites

  9. sirhawkings
    February 5, 2013 at 3:04 am

    Oh wait it is osmosis. Active transport is for mineral salts..

  10. sirhawkings
    February 5, 2013 at 3:56 am

    Wait it water enters from active transport not osmosis

  11. Gregor Wilke
    February 5, 2013 at 4:54 am

    That accent >

  12. Nestor Mateus
    February 5, 2013 at 5:30 am

    Like si están viendo esto por el enlace de fisiología vegetal de la UNAD

  13. Lloyd Godman
    February 5, 2013 at 5:32 am

    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

  14. saran1989124
    February 5, 2013 at 6:08 am

    good one…!!!

  15. Kurt Giles Quinto Badon
    February 5, 2013 at 6:49 am

    I like it!

  16. Andrew Park
    February 5, 2013 at 7:29 am

    i hate this the voice is weird and its so not clear

  17. TheJulia5045
    February 5, 2013 at 8:25 am

    I love water or Tuesday wich should I like

  18. Cypfer
    February 5, 2013 at 8:30 am

    I hate how the stomatal opening reminds me of a females genitals..

  19. TheMissManaliD
    February 5, 2013 at 9:29 am

    Thank you so much, you deserve most of the credit for my A+!!! 😀

  20. petebrayscuba
    February 5, 2013 at 10:20 am

    the tallest tree which is several metres tall… i like this!

  21. Nadeem Feyrozai
    February 5, 2013 at 10:27 am

    realyyyyyyyyyyyyyyyyyyyyyyyyyyyy gooooooooooooooooooood

  22. onnightblueend
    February 5, 2013 at 11:07 am

    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.

  23. ethangarcia234567
    February 5, 2013 at 11:51 am

    I loev it!

  24. adithyaraghavvarma
    February 5, 2013 at 12:24 pm

    yes the explanation is good

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