no I'm not a geek, I just need to finish a stupid science essay.
No dumb answers please.
Thank you.
2007-03-26 06:36:18 · 5 answers · asked by supersonic_152000 1 in Science & Mathematics ➔ Biology
i think it is when it is windy the cells go turgid or summat like that to stop being snapped in half..
2007-03-26 06:40:00 · answer #1 · answered by xXx Catherine xXx 3 · 0⤊ 0⤋
The wall between guard and subsidiary cell and the wall that makes up the opening are rather thin and are easily stretched. This asymmetry of the cell’s structure and of the wall thicknesses explains the directed movement caused by the turgor. The mechanics of the guard cells becomes thus understandable. The explanation how the movement is elicited and regulated was more difficult to find. Water proved to be an important, though not the only controlling factor of guard cell movements.
Guard cells can emit water into three different directions:
outwards,
into the neighbouring subsidiary cell, and
into the respiratory cavity that is a part of the intercellular system lying beneath the guard cells.
An equilibrium between the water vapour of the atmosphere and the respiratory cavity results when the stomata are opened. Plants form an intermediate distributor, since a large difference in water potential between the moist soil and the normally dry atmosphere is very common. Plants profit from the concentration gradient (that is a gain of energy for them), while the closing movements of the stomata exert a decisive, regulating influence. They close when too much water is lost, or when not enough supply exists. The osmotic pressure of the stomata is far larger in the guard cells than in the subsidiary cells. This ratio shifts in favour of the subsidiary cells when the stomata are closed.
2007-03-26 13:42:27 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Basically in certain weather and at night, the guard cells fill with water and go turgid. This closes the stomata, therefore stopping transpiration occuring.
I hope this helped :D
2007-03-28 12:53:02 · answer #3 · answered by Airelle 2 · 0⤊ 0⤋
Te guard cells, opens and closes the stomata when there is a drought, at night, really hot day.
2007-03-28 20:18:36 · answer #4 · answered by Acorn barnacle 2 · 0⤊ 0⤋
dude, wikipedia is right there...click it...go on.....do it
2007-03-26 13:43:00 · answer #5 · answered by Anonymous · 0⤊ 0⤋