Science How Water Travels Through Roots Stems and Tubes
Explain how water travels through the roots stems and tubes to the plants leaves. Not sure exactly how this happens yourself? Laura Hamilton shares this wonderful process with us.
Plants use little tubes to transport water from where they have it (the ground, usually) to where they need it (in their leaves, where it is “breathed out” through little pores called stomata.
In this science activity children will be able to see the colored water travel through tubes around the entire leaf.
At least 2 Napa Cabbage leaves (largest you can find)
2 clear jars
2 different food coloring colors (Red & Blue)
1.) Slice each Napa Cabbage stalk halfway up the middle.
2) Place the two clear jars close together. For this experiment A few drops blue food coloring was added to the left container and a few drops of red to the right jar.
3) Add water to the jars to fill to about 1.5 inches deep.
4) Wait about 8 hours and observe the difference!
How It Works:
These tubes are called xylem – en.wikipedia.org/wiki/Xylem. When you place the bottom of the cut stem in dyed water, the leaf continues to breathe out water through the stomata, and that acts like sucking pressure on the straw-like tubes of the xylem, so the dyed water is drawn up through the leaf. On the way, it colors the xylem tubes and you can see how they network through the leaf.