I been thinking
I can see how water gets from the roots of a plant tp the leaves
powered by evaporation and capilliary attraction. However I don't see how sugars etc get from the leaves to the root, tubers and fruits of a plant. This implies two way flow. Anyone know the answers to this? |
I been thinking
On Nov 18, 7:53*am, harry wrote:
I can see how water gets from the roots of a plant tp the leaves powered by evaporation and capilliary attraction. However I don't see how sugars etc get from the leaves to the root, tubers and fruits of a plant. This implies two way flow. Anyone know the answers to this? Remembering way back to school biology, a plant has two fluid transport systems - 'Xylem up, phloem down'. Xylem takes fluid (and thus substances in solution) from root to leaf, phloem the reverse. Wikipedia seems to agree that what I was taught hasn't changed much: http://en.wikipedia.org/wiki/Phloem. Regards, Martin. |
I been thinking
On Nov 18, 7:59*am, Martin_Stevens wrote:
On Nov 18, 7:53*am, harry wrote: I can see how water gets from the roots of a plant tp the leaves powered by evaporation and capilliary attraction. However I don't see how sugars etc get from the leaves to the root, tubers and fruits of a plant. This implies two way flow. Anyone know the answers to this? Remembering way back to school biology, a plant has two fluid transport systems - 'Xylem up, phloem down'. Xylem takes fluid (and thus substances in solution) from root to leaf, phloem the reverse. Wikipedia seems to agree that what I was taught hasn't changed much:http://en.wikipedia.org/wiki/Phloem. Regards, Martin. I always found chemistry and physics more interesting than biology. Apart from girls that is. So if I have a melon on a plant, does the sustennace come forme the leaves between the root and the melon or the tip of the vine and the melon? |
I been thinking
harry wrote:
I can see how water gets from the roots of a plant tp the leaves powered by evaporation and capilliary attraction. However I don't see how sugars etc get from the leaves to the root, tubers and fruits of a plant. This implies two way flow. Anyone know the answers to this? Vascular bundles! |
I been thinking
It is VERY dangerous to think! Alan "harry" wrote in message ... I can see how water gets from the roots of a plant tp the leaves powered by evaporation and capilliary attraction. However I don't see how sugars etc get from the leaves to the root, tubers and fruits of a plant. This implies two way flow. Anyone know the answers to this? |
I been thinking
On Nov 18, 7:55*pm, "alan.holmes" wrote:
It is VERY dangerous to think! Alan "harry" wrote in message ... I can see how water gets from the roots of a plant tp the leaves powered by evaporation and capilliary attraction. However I don't see how sugars etc get from the leaves to the root, tubers and fruits of a plant. This implies two way flow. Anyone know the answers to this?- Hide quoted text - - Show quoted text - I know. It makes my head hurt! |
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