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some question 'bout botany

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some question 'bout botany

Postby victor » Mon Jul 04, 2005 11:58 am

I hope someone here can help me about botany since I'm no good at this.... :cry:
-heat increasing will make the anaerob condition in the pond run slowly. (right/wrong)
-Heat increasing if it's not too high, will make the photosynthesis of the algae run faster and produces some oxygen. (right/wrong).
I chose W for the first and R for the 2nd.

Which is the correct one??(you can choose more than one answers)
-Oxygen production during the day (Pm) will have a big scale in the muddy water.
-Pm has the biggest scale for green coloured light. *
-If the nutrition scale is high, so does the Pm.
-Pm has a bigger scale during the summer. *

(*) means my answer for the question. If you think that my answer is wrong please make a correction in your reply and give a logic reason for that..(don't just give the answer without reason) :wink:
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Postby MrMistery » Mon Jul 04, 2005 7:59 pm

Photosynthesis is most intense in red light, not green. Only in red algea it is more intense in green light. So i don't think you should put a * on the second one
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Postby victor » Tue Jul 05, 2005 12:37 pm

Whoa..red??? Till now I always think that green affect the most..but the reality is the light which has the biggest wave length...thanks.. :D
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Postby James » Tue Jul 05, 2005 2:24 pm

Green light is not used at all, chlorophyll reflects it.
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Postby MrMistery » Tue Jul 05, 2005 8:45 pm

Not quite, check a graph. the plants uses all kinds of light. It's just that the usage of green light is very very close to 0
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Postby victor » Thu Jul 07, 2005 6:02 am

WHAT!!! hey then if the question asked about which light colour affect the photosynthesis the most?? is it red and blue? oh no, I answer red and green....damn!!!
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Postby James » Thu Jul 07, 2005 11:34 am

Chlolphyll is seen as green, thus it must reflect a high proportion of the green wavelength.
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Postby Karen » Thu Jul 07, 2005 12:29 pm

this is why greenshading clothing goes beyong my understand, it absorbes the other colors and "reflects" the green into the greenhouse... most often this is not a problem when there is plenty of natural light, but for some light lovers it is supposed to be able to cause problems with growth/blooming.

Or is there something else that is good about green shade clothing, except that it perhaps doesnt look too flashy? Am I missing something here?
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green light

Postby dijitolboy » Mon Jul 18, 2005 1:28 pm

:idea: I'm not a plant person per se.....but, physics: THAT'S my style. James' response is undeniable: if the leaves of a plant appears to be green, than green is the spectrum of light that it is not using (or getting nominally small amounts of, if you'd like to talk about thousandths of micro-einsteins). Because green is blue and yellow, than one must conclude that it is the lower bands (i.e. larger wavelengths) of red light that a plant uses most. However, after researching, it has become obvious that a plant uses some of the blue spectrum, but not directly. The green color of a leaf is comprised of slightler higher amounts of yellow light than blue; therefore, some blue light is used, but it is now thought to be the plant's method of "knowing" how much light it is recieving. In other words, a plant GROWS bigger from red light, and it "knows" how big to make it's leaves based off of blue light, because how much blue component it is recieving is a good indicator of the total light available. A plant with only red light will stretch, because without blue light, it thinks it is recieving NO light. :idea:
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Postby MrMistery » Mon Jul 18, 2005 7:30 pm

I'm surprised that you know this if you say botany is not your thing. This is IBO stuff... Blue lighttriggers a very complex mechanism that opens and closes the stomas of a plant. That is how it knows...
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Postby victor » Tue Jul 19, 2005 1:04 pm

MrMistery wrote:I'm surprised that you know this if you say botany is not your thing. This is IBO stuff... Blue lighttriggers a very complex mechanism that opens and closes the stomas of a plant. That is how it knows...


Now you've known my weak point.. :wink: but, now I try to review and review about botany again (even though it always makes me confuse whether to choose botany of my new chapter about immunology.. :wink: ). i also try to find a good botany book..can you suggest some??
Hey Andrew, as you know that in my school (the so-bad one), there's nothing about the info for IBO even from the material or another else...so at that time, I only foccusing on human anatomy..that's all...if I had known about those things about IBO, I would have studied about those....damn!!!
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Postby MrMistery » Tue Jul 19, 2005 6:46 pm

I thought you graduated already. Anyways, IBO focuses more on stuff you can't see: genetics, cellular bio, microbiology etc. Which is fine since i like them. Human anatomy is only something like 5%
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