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Transpiration Please help Me

Plants!

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Postby jwalin » Mon Oct 12, 2009 2:35 pm

another question
a transpirational pull tends to pull the water up. its just like sucking a fine straw. but if there are 50m long trees what then. i come to know and think of tat the pull is just not enough. try taking a longer straw. harder its to bring the water to the tap.
the column tend to break.
in the larger plants there would be higher probabilities of air spaces. would there be?? i do think so. what then.
i also do understand that cohesion and adhesion play a great role.
it isn't what you do that matters but it is how you do it
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Postby JackBean » Tue Oct 13, 2009 12:45 am

Where will you take the air bubbles inside of a tree? I guess the length doesn't really matter.
http://www.biolib.cz/en/main/

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Postby jwalin » Tue Oct 13, 2009 1:41 am

i do not think so. the straw example.
if you think keeping a little physics in mind what about the external resistance???
air, by xylem???
someone please help.
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Postby JackBean » Tue Oct 13, 2009 2:47 am

Yeah, it will be harder to bring water to 2m instead of 1, but it does not matter, whether you move it for 1m in 2m or 10m long tube ;)
In my opinion
http://www.biolib.cz/en/main/

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Postby jwalin » Tue Oct 13, 2009 3:52 am

??
unclear
??
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Postby JackBean » Tue Oct 13, 2009 7:53 am

Imagine, that you have some luggage and you are supposed to take it by stairs to 1st or 2nd floor. When will you have to use more energy? I guess in the second case, right?
But what if you have to take it from basement to 1st floor OR from 5th to 6th? I guess here you will need the same energy in both cases, don't you think so?
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.
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Postby jwalin » Tue Oct 13, 2009 8:17 am

that is right.
but taking from ground to 50 th is different from ground to first.
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Postby JackBean » Tue Oct 13, 2009 8:24 am

sure, that is the first case ;) I'm talking about that, that if plant once start (as a very little seedling), than it just continues and doesn't care, how high
http://www.biolib.cz/en/main/

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Re: Transpiration Please help Me

Postby abarnett » Mon Oct 19, 2009 6:59 pm

active transport is when the particles go into the cell using a special pathway because they are too big :P
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Re: Transpiration Please help Me

Postby addisongrace22 » Mon Oct 19, 2009 7:05 pm

Does active transport occur in plant cells as well as animal cells? Or is it specific to certain types of cells?
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Re: Transpiration Please help Me

Postby Vsalazar » Mon Oct 19, 2009 7:10 pm

well I think its diffusion because it spreads widely. So The sap would spread. That's just my opinion. :D
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Re: Transpiration Please help Me

Postby whawth » Mon Oct 19, 2009 7:19 pm

The example of the straw example works but when the tree uses water it has different compartments in it that each use the water so it would be like using a straw with tiny holes in it all the way up the straw and instead of pulling in air the pull the water out of the inside of the straw so if there is any air bubbles they would be move to above the water the come out the pores in the tree bark at the top. After all the tree breaths through the bark.
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