2007-01-18 07:25:27 · 4 answers · asked by will t 2 in Science & Mathematics ➔ Biology
The answers above are right, but you may be looking for guard cells. Guard cells actually provide for the opening, and it is how turgid the guard cells are that determine whether or not they open, which is influenced by the above factors.
2007-01-18 08:37:26 · answer #1 · answered by btpage0630 5 · 0⤊ 0⤋
I remeber this from my AP bio class.
The stomata are filled w/ k+ (potassium) and k+ attracts water. When the plant wants to close the stomata, it pumps out the K+, and the water (h2o) follows it. That causes the stomata to be pushed shut.
The reverse happens when the plant wants to open the stomata.
2007-01-18 08:24:05 · answer #2 · answered by motors2005_tk 2 · 0⤊ 0⤋
Basically, sunlight makes them open and they close at night. However, if the plant is lacking water or if the air is very dry, they tend to close. The concentration of CO2 also affects their opening, with low CO2 causing them to open.
http://www-saps.plantsci.cam.ac.uk/records/rec106.htm
This website includes an explanation of HOW they open and close.
2007-01-18 07:36:54 · answer #3 · answered by hcbiochem 7 · 0⤊ 0⤋
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I suggest you read a book on plant physiology. Its quite a detailed subject.
2007-01-18 07:45:54 · answer #4 · answered by Anonymous · 0⤊ 0⤋