Which statement is incorrect?

• A
  Intine is the inner wall of pollen grain and exhibits a fascinating array of patterns and designs.
• B
  The mature pollen grain has two cells: the bigger is the vegetative cell and the smaller is the generative cell,which floats in the cytoplasm of the vegetative cell.
• C
  Carrot grass pollen causes pollen allergy.
• D
  Pollen grains of pea and rose maintain viability for months.