Have you ever wondered how a leaf gets the water it needs?

Leaf lace

Originally uploaded by CameliaTWU

If you have ever wondered how a leaf gets it’s water, then have a look at this You Tube clip http://www.youtube.com/watch?v=w6f2BiFiXiM&feature=fvsr.

Sir David Attenborough explains how water gets from the roots in the soil, right up to the leaves on the very top of a tall sycamore tree.

Xylem

Water somethimes has to travel a long way and travels up long thin tubes inside a plant called xylem.

According to The National Science Teachers Association (US) Elementary Science Classroom site located at:
http://www3.nsta.org/main/news/stories/science_and_children.php?news_story_ID=49197

Water Attracts

Water moves up the xylem through a process called capillary action. Capillary action allows water to be pulled through the thin tubes because the molecules of the water are attracted to the molecules that make up the tube. The water molecules at the top are pulled up the tube and the water molecules below them are pulled along because of their attraction to the water molecules above them.

This webpage also describes a cool experiment where you can see this process happen.

Check it out!!!

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