things present in cells

Plants!

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stunner_9
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things present in cells

Post by stunner_9 » Mon Apr 24, 2006 8:39 am

i need confirmation on dat 1
it seyz dat the stomata of some plants close for an hour or more at about midday. explain whether there is likely to be any advantage for the plant.

i actualli wrote that it can both advantage and disadnavtage as when it closes the plant doesn't get excess carbon dioxode but it can be a disadvantage because for one hour or more photosynthesis cannot occur.......

am i right????

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mith
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Post by mith » Mon Apr 24, 2006 2:22 pm

Think more about transpiration, heat and dehydration.
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Post by stunner_9 » Sun Apr 30, 2006 5:04 am

wat do you mean?
how can those factors make the stomata close for one hour or more?

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Post by Poison » Sun Apr 30, 2006 9:33 am

Then think how does stomata close? And try to make connection between them .
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Post by SU_reptile » Mon May 01, 2006 7:18 pm

It has great adventage, because at noon the temperature mostly reaches it's highest point and consequently it brings about that plants undergo particularly excessive transpiration. So to stand up to that factor stomata close for the time that temperature is high. A few hours without carbon dioxide don't affect plant physiology very much.
Remember that there are other factors that make stomata open/close, for example light conditions (light makes them open and darknes makes vice versa), concentration of carbon dioxide (at night, when plants undergo particularly high respiration, carbon dioxide evolves and it causes closure of stomata), pH (that mostly refers to the CO2 - acidic) and some phytohormones (for example ABA)

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Post by stunner_9 » Tue May 02, 2006 8:17 am

well, thank you i think i get it now

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Post by stunner_9 » Tue May 02, 2006 8:30 am

but....since plants,...etc...... are being destroyed everyday and that the gases(oxygen, carbon dioxide) are not really balanced wouldn't that affect plants growth????/

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Post by SU_reptile » Tue May 02, 2006 10:24 am

I think that this lack of balance of gas composition in the atmosphere doesn't much affect plant physiology. Just take a look at our lives. Only the results (climate change for example) may be perceived.
By the way, sorry if there is something wrong with my English.

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Post by mith » Tue May 02, 2006 10:39 pm

stunner_9 wrote:but....since plants,...etc...... are being destroyed everyday and that the gases(oxygen, carbon dioxide) are not really balanced wouldn't that affect plants growth????/


They grow everyday too....
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Post by waterboy » Sat May 06, 2006 7:05 pm

It has great adventage, because at noon the temperature mostly reaches it's highest point and consequently it brings about that plants undergo particularly excessive transpiration. So to stand up to that factor stomata close for the time that temperature is high. A few hours without carbon dioxide don't affect plant physiology very much.
Remember that there are other factors that make stomata open/close, for example light conditions (light makes them open and darknes makes vice versa), concentration of carbon dioxide (at night, when plants undergo particularly high respiration, carbon dioxide evolves and it causes closure of stomata), pH (that mostly refers to the CO2 - acidic) and some phytohormones (for example ABA)

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