One significant difference between roots and stem is that

• A.Branch roots originate in the pericycle while stem do not
• B.Stems are always bove the ground while root are always below the ground
• C.Stems are positively geotropic while roots are negatively geotropic
• D.Stem are sometime used for storage while roots are never used
• E.Stems grow in both length and circumference while root grow only in length