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water

light

carbon dioxide

circadian rhythms

2006-12-29 10:28:32 · 4 answers · asked by jay 1 in Science & Mathematics Biology

4 answers

Egads, ignore the answers above. Guard cells respond directly to light and CO2. They also undergo a circadian rhythm. That leaves WATER as the only viable answer.

Stomata are involved in drought stres but the effects of dehydration are not direct. Rather, dehydration causes abscisisc acid to be produced, and abscisic acid closes the stomata.

2006-12-31 02:26:20 · answer #1 · answered by ivorytowerboy 5 · 0 0

The answer is light and circadian rhythms. Light only indirectly causes opening. Assuming we are talking about the stomates on the bottom of a leaf surface...

2006-12-29 12:09:16 · answer #2 · answered by Ryan M 3 · 0 2

definitely circadian rhythms...circadian rhythms means that it would happen every x amount of hours, regardless of the environmental conditions...for example, approximately every 16 hours after waking up we are ready for bed again, that is our circadian rhythm (internal clock)
but plants are all about responding to the environment around them so that they can utilize when light/water/CO2 are in excess
hope it helps

2006-12-29 12:37:01 · answer #3 · answered by Anonymous · 0 1

A stoma (additionally stomate; plural stomata) is a tiny beginning or pore, got here across oftentimes on the less than-floor (dermis) of a plant leaf, and used for gasoline replace. The pore is formed with the aid of a pair of actually professional parenchyma cells trouble-free as guard cells that are in charge for regulating the size of the outlet. Air containing carbon dioxide enters the plant with the aid of those openings the place it gets used in photosynthesis and respiration. Oxygen produced with the aid of photosynthesis interior the chlorenchyma cells (parenchyma cells with chloroplasts) of the leaf indoors exits with the aid of those comparable openings. additionally, water vapor is released into the ambience with the aid of those pores in a technique referred to as transpiration.

2016-11-24 23:45:35 · answer #4 · answered by phegley 4 · 0 0

I would think circadian rhythms.

2006-12-29 10:40:40 · answer #5 · answered by Anonymous · 0 2

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