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  2. Guard cell - Wikipedia

    en.wikipedia.org/wiki/Guard_cell

    Guard cells have cell walls of varying thickness(its inner region, adjacent to the stomatal pore is thicker and highly cutinized [7]) and differently oriented cellulose microfibers, causing them to bend outward when they are turgid, which in turn, causes stomata to open. Stomata close when there is an osmotic loss of water, occurring from the ...

  3. Stoma - Wikipedia

    en.wikipedia.org/wiki/Stoma

    Stoma in a tomato leaf shown via colorized scanning electron microscope image A stoma in horizontal cross section The underside of a leaf. In this species (Tradescantia zebrina) the guard cells of the stomata are green because they contain chlorophyll while the epidermal cells are chlorophyll-free and contain red pigments.

  4. Stomatal conductance - Wikipedia

    en.wikipedia.org/wiki/Stomatal_conductance

    Stomatal conductance, usually measured in mmol m −2 s −1 by a porometer, estimates the rate of gas exchange (i.e., carbon dioxide uptake) and transpiration (i.e., water loss as water vapor) through the leaf stomata as determined by the degree of stomatal aperture (and therefore the physical resistances to the movement of gases between the air and the interior of the leaf).

  5. File:Stoma Opening Closing.svg - Wikipedia

    en.wikipedia.org/wiki/File:Stoma_Opening_Closing.svg

    The stomata open when the turgor pressure increases in the guard cells, causing the cells to buckle outward. This happens when water flows into the guard cells. Water flows into the guard cells after K+ ions enter the cells, because the water is flowing down its concentration gradient to keep the solute level the same inside the cell as outside.

  6. Homoiohydry - Wikipedia

    en.wikipedia.org/wiki/Homoiohydry

    Gas exchange with the atmosphere is controlled by stomata, which can open and close to control water loss, and diffusion of carbon dioxide to the chloroplasts takes place in intercellular spaces between chlorenchyma cells in the stem or in the mesophyll tissue of the leaf. [1]

  7. Trump to discuss ending childhood vaccination programs with ...

    www.aol.com/news/trump-discuss-ending-childhood...

    (Reuters) - U.S. President-elect Donald Trump in an interview published on Thursday said he will be talking to Robert F. Kennedy Jr., his nominee to run the Department of Health and Human Services ...

  8. ‘They’re girls, not wives’: Colombia votes to outlaw child ...

    www.aol.com/news/girls-not-wives-colombia-votes...

    The initial proposal to reform the law used the slogan “They’re girls, not wives” and aimed to prevent young girls from being forced to marry.

  9. Transpiration - Wikipedia

    en.wikipedia.org/wiki/Transpiration

    The stomata are bordered by guard cells and their stomatal accessory cells (together known as stomatal complex) that open and close the pore. [5] The cohesion-tension theory explains how leaves pull water through the xylem. Water molecules stick together or exhibit cohesion.