Includes articles on over one hundred science-related topics, such as air, evolution, the metric system, and whales.They include the prop roots of corn and certain other plants. Prop roots grow down into the soil from the lower part of the stem Taproot System (Dandelion) Fibrous Root System (Grass) WORLD BOOK diagrams by Robert Keys The two chiefanbsp;...
|Title||:||World Book's Science Desk Reference|
|Author||:||World Book Encyclopedia|
|Publisher||:||World Book - 1991-08-01|