Primary and Secondary Roots

• primary root definition | Dictionary.com
  Definition of primary root at Dictionary.com with free online dictionary, pronunciation, synonyms, and translation. Word of the Day and Crossword Puzzles.
  (tags: primary root)
• Mycorrhizal Associations: Structure of Roots
  root systems
  (tags: biology nature science)
• Root - Wikipedia, the free encyclopedia
  A true root system consists of a primary root and secondary roots
  (tags: science root botany)
• Plant roots
  primary secondary root rootcap roothairs
  (tags: roots)
• How to Grow Cuttings from Established Plants - wikiHow
  wikiHow article about How to Grow Cuttings from Established Plants.
  (tags: garden how plants)