This song is available on Robin Walling's
Science In Song III: Animal Kingdoms.

Sung to "This Old Man"

Xylem’s up, phloem’s down
Carrying food all around
Xylem takes it from the roots
Phloem transports sugary food

In between them, you will find
Cambium makes cells all the time
Phloem’s closest to the bark
Xylem’s near the center part

Photosynthesis, you’ll see
Makes the food for the tree
CO2 and the sun
And chlorophyll, round out the fun

Making food in the leaves
Glucose that is sugary
Xylem’s up, phloem’s down
Carrying good food all around!

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Many thanks to Robin Walling for permission to display these lyric excerpts.
© Robin Walling. All rights reserved. Used with permission.

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