The only sporophytes that do not contain these are liverworts.
The only sporophytes that do not contain these are liverworts. They are surrounded by cells that lose potassium when triggered by abscisic acid, reversing a process started by phototropin and causing a loss of osmotic pressure and turgor. Those parenchyma [pair-en-KY-mah] cells next to these cells are called guard cells. Changes in these structures, which often take place in the morning and late afternoon, have a direct impact on the rates of transpiration and respiration of the plant. Name these gas exchange locations on a plant epidermis, essentially tiny holes.
The only sporophytes that do not contain these are liverworts.
stomata [do not accept “stroma”]