POSITIVE GRAVITROPISM

• WHERE DOES GRAVITROPISM OCCUR IN PLANTS?

  in roots
• PROCESS OF POSITIVE GRAVITROPISM?

  1. Cells in root tip produce IAA
  2. IAA diffuses down root
  3. IAA accumulates on lower side of root
  4. IAA inhibits cell elongation
  5. Cells on lower side are shorter
  6. Root grows downwards towards gravity