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I need serious help about dandelion stem

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I need serious help about dandelion stem

Postby novastar_ » Sun Feb 06, 2005 5:37 am

why does the stem curve immediately after cutting?
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Postby novastar_ » Sun Feb 06, 2005 6:03 am

Please, can some kind, smart souls help me? my homework's due tomorrow..... :cry:
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Postby mith » Mon Feb 07, 2005 1:00 am

Is it because there's a lack of pressure in the stem and that causes the stem to lose rigidity?
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Postby ERS » Mon Feb 07, 2005 2:37 am

turgor pressure, to be more specific.
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Postby novastar_ » Mon Feb 07, 2005 11:30 am

Why is there a lack of tugor pressure?
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Postby mith » Mon Feb 07, 2005 8:52 pm

Imagine a balloon( the long ones). It's pretty rigid right? Now pop the balloon or cut it in half. The rubber isn't rigid anymore right?
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Postby novastar_ » Tue Feb 08, 2005 9:08 am

I see, but y is it curved unevenly? the outer layer becomes shorter than the inner layer...... is it because the outer layer tends to lose water to its surroundings easily?
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Postby mith » Tue Feb 08, 2005 8:26 pm

What do you mean curve unevenly? Is there an even curving? I'm thinking if a plant stem goes limp, it just kinda curves depending on how the flower is balanced.
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Postby novastar_ » Sun Feb 13, 2005 2:34 pm

is it because of a lack of turgor pressure in the cortex cells?
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Postby RobJim » Sun Feb 13, 2005 2:41 pm

I see, but y is it curved unevenly? the outer layer becomes shorter than the inner layer...... is it because the outer layer tends to lose water to its surroundings easily?

It kind of sounds like you're saying the end of the cut stem expands wider, like a trumpet, or bell bottom pants; in other words, the walls curve outward, but the stem as a whole doesn't curve. If that's the case then the answer is probably that the inside of the stem is under high pressure, and when the inside is exposed to atmospheric pressure the inside part of the stem expands. This would cause the walls of the stem to curve outwards in the same way that a bimetallic strip bends when the temperature is changed.

I don't really know, but this would explain it if that's what you meant.
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