Directional plant grows response to a stimulus
Rapid, reversible, non directional response to a stimulus. Caused by changes in turgor pressure
Protective sheath on shoot tip. Sensitive to light and gravity.
High concentration of auxin in roots
inhibits growth eg 10^-4
High concentration of auxin in shoots
promotes growth eg 10^1
Extension of the embryo, develops into a shoot
Extension of the embryo, develops into a root
Where are auxins produced?
in shoot and root tips.