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when it turns red is anything given??
no they are asking our knowldge on respiration and photosynthesis, i think its C, because photosynthesis reduces the CO2 concentration, but then is replaced by the open air....and obvious the respiration in the other plant increases the CO2

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@zaphod , option B seems right to me because plants in light take in carbon-dioxide and give out oxygen , so carbon-dioxide decreases and hence solution turns purple But in the dark, plants take in oxygen and give out carbon-dioxide . So the solution turns yellow
BUT THE carbon dioxide concentration is replaced, then why does it decrease
@zaphod , I doubt that CO_2 will be replaced so easily because gases don't tend to dissolve so easily in liquids
I would say. The intake of CO_2 dioxide by plants is much larger than the Co_2 which dissolves from air
@heena , I am not sure. You know better than me in all this. :)
well sorry for late reply and i m also not sure but in test tube P it is uncovered mean there is CO2 in normal amount and Oxygen too but in test tube Q u see it is covered with black cloth means stops the light to enter in it so there will be oxygen as well as cO2 also but in less concentration which mean reasult can be red now going agian to P tube here tube opening i narrower which reult there will be more amount of oxygen as in photoynthesiss oxygen is release o in P test tube the colour should be purple so ill go with A)
but i ll till say i m not sure .. (:
wait, if they dont dissolve in liquids, how come they do in sea(aquatic plants)
@heena , are you sure that plant Q is red. That is don't release carbon-dioxide,
(according to you)
@zaphod , read carefully what I said: "The intake of CO_2 dioxide by plants is much larger than the Co_2 which dissolves from air"
@blues can help in this :)
if u ll talk abu sea this is the different case as under sea max amount of light dont get trapped by plants so they usually show chemoautrophim
yea it dont realease carbon dioxide but in Q u see it is covered and soon the all CO2 will be get used by plants and only more amount of O2 concn will remain there
heena !!!! Plants take in oxygen in absence of light and not carbon dioxide :P
:O where u read this??
@heena , plants take in carbon dioxide during photosynthesis which occurs in presence of light. In absence of light, plants take in carbon dioxide as they cannot do photosynthesis
@heena , read more here: http://www.blurtit.com/q909132.html
well as dair i knw CO2 is taken by plant and they have diff mechanism as these are adapted to reduce traspiration rate i guess u were talking abu CAM PLaNTS
In simple words, plants emit carbon-dioxide in night because of process of respiration In presence of light, they emit oxygen due to photosynthesis
another link : http://www.enotes.com/science/q-and-a/why-do-plants-breath-oxygen-night-109969 Let @blues clear this for you
no actaully in cam plants in which u are saying there at day time dey trap light and and CO2 but thi mechanism is done in two different cell that is mesophyll and bundleheath
I am not sure about what you are saying @heena . I shall wait for @blues to confirm whether I am wrong or not
at the time of night the photoynthesis is done and if we talk abu normal plant they trap light break water molecules and get ATP and then convert CO2 to carbohydrate by doing several type of mechanism .and acc to the qn in ea there is hyrovents for creating heat which help aqautic plants to do photoynthesis as not dat much availiability of light
yea evn i also say : over it to @blues :) as the mechanism is so impt and lengthy i cant explain u in breif :)
The questions asks about photosynthesis and the changes photosynthesis will have on the concentration of CO2 in the water. Hopefully everyone agrees about that. When there is light, photosynthesis will occur and when it is dark, no photosynthesis will occur. In the context of the problem, that means that photosynthesis will occur in tube P but it will not occur in tube Q. Photosynthesis uses CO2. Therefore, the concentration of CO2 in the tube with the actively photosynthesising pond week (Tube P) will decrease. Some CO2 will diffuse into it from the air, but not much. And it will be readily reused by the pond weed for more photosynthesis - so the end result is that the CO2 concentration in Tube P will decrease. Tube P will turn yellow. There will be no photosynthesis in Tube Q. Therefore, there will be *no change* in the CO2 concentration in Tube Q. Tube Q starts red and it ends red. The answer is A.
@blues , Since there is no photosynthesis in tube Q, therefore respiration should occur and hence plants should take in oxygen and give out CO_2 , right ??
There is sometimes some confusion about this because plants do *use* oxygen for respiration - but they take that oxygen entirely from the CO2 they break down during photosynthesis. It is not oxygen it takes in from the environment. So they won't be taking in any oxygen from the fluid in Tube Q.
ohh. I am still pretty varied about that. As far as I learnt, plants take in oxygen in night and give out carbon dioxide. @blues , you might want to have a look here http://answers.yahoo.com/question/index?qid=200710141315a01AA46TCT
"This Question has been deleted." Hmm?
yea shivam plants do dat and it happens in CAM plants they adpated thi mechanism for reducing trasnpiration rate and get large maount of product
I guess technically the oxygen molecules can also come from water, but not raw environmental O2. But pond weed, Heena, is about as unlike a CAM plant as plants can be.
http://www.youtube.com/watch?v=Dq38MpYOb8w
sorry unable to get this" But pond weed, Heena, is about as unlike a CAM plant as plants can be."
Some plants are CAM plants. They tend to be plants which evolved in very dry circumstances or which need to conserve water because they live in water poor environments. Some plants are not CAM plants. Pond weed, which is what this question asks about, is not a CAM plant.
Are further questions all? That one looks like it's still hanging but if you're all happy I have things I need to get on with....
so weed in which category u ll include it C3 or C4 or CAM ?
i think qn is getting messy better we will dicusss this on chat @blues
Depends on what kind of weed, Heena. But this is pond weed. It lives under water. So it does not need to be thrifty about conserving water.
hmm right but no light as it deep i mean not sufficient light
Which is why pond weed lives only in shallow water. Plenty of light gets through. You are not going to find it growing in trenches at the bottom of the ocean, but a meter under water on the blank of a warm shallow pond, sure. There is plenty of light.
right but in bottom till some plant are found wbu them?
What about them? First of all, there is not much plant life at the bottom of deep likes for precisely that reason. Second of all, some species of aquatic plants have evolved to live on very little sunlight and do live at depths which would kill other plants.
sry i forgot abu this qn lol and at bottom of ea there i a presence of hydrovent but my doubt is -is that evbery where where plant are there is hydrvent? is there any relation btw dem?
I don't understand. What do you mean by "hydrovent?"
It is not a standard biologic term.
my teacher toold due to earth preure some where is breakeage dat y there is a presence of sulphur spring not remember correct statements but smthing like that
OK fissures like that are at the bottom of the ocean. Miles deep in salt water and isolated from everything around it by darkness and cold. Not in the bottom of shallow, well lit freshwater ponds like this pond weed came out of.
Does anyone else have questions on this one?
Sorry for the late reply @blues , but I am a bit unsure about tube Q. While there is no photosynthesis occurring, isn't cellular respiration still going on? And through Krebs Cycle and the creation of acetyl-CoA, CO2 would be released right - causing the solution to turn yellow?
Yes, plants respire in the dark, so tube Q will have increased CO2 and turn yellow. The question remains whether in tube P the CO2 fixed by photosynthesis will be replaced by diffusion of CO2 from the air. I believe it will, so I agree with @zaphod that the answer is C.

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