in day light , they are open, and perform the following three functions
1 Transpiration
2 Gaseous exchange
3 Promotion of ascent of sap***
OpenIn day light , they are open, and perform the following three functions1. Transpiration2. Gaseous exchange3. Promotion of ascent of sap
The stomata closes duirng the night when there is no light, this is because photosynthesis only takes place during the light and that is when the stoma is open , to let in carbon dioxide for photosynthesis. Otherwise it is closed. =D hope this helps
probably means it is shut. since carbon dioxide goes through the stomata and is necessary for photosynthesis then if there is a low amount of it in the leaf then the stomata must be shut
A light switch
usually the door isn't completely shut if the light is still on
The Guard cells
the door ajar light is staying on all the time
Guard cells change shape to open and close stomata. When they are flaccid, the stoma is closed. When they are full of water and firm, the stoma is open. There are 2 guard cells controlling a stoma. Water enters guard cells by osmosis and they change shape.
an umberella
One of the doors is open (or not shut properly).
When the interior light flashing, check all doors, they might be open or not shut tightly.
If you mean a surgically created opening to the urinary bladder or to the intestines, or for a tracheostomy, they are open. e.g. A stoma IS always open. A temporary stoma may be made and later closed, but by definition, stoma is an "opening".1. Picture of trach stoma. - This shows a trach stoma cap which protects the stoma.2. Picture of a loop ileostomy. -- Whether the stoma opens to bowel or bladder, the outside of the stoma appears basically the same. If for bladder, a small flexible tube is kept put through the stoma; a see-through "bag" attached to the skin (or upper thigh) collects the urine which the person must dump. The tubing is replaced periodically. If for bowel, a see through pouch is affixed onto the skin, over the stoma, to collect feces. The feces must be 'dumped' also.On any stoma, the area must be cleansed or the tender tissue can break down, bleed, become infected, etc.