The generative cell of a two-celled pollen divides in the pollen tube but not in a three-celled pollen. Give reasons.
$A$ : Initial growth of pollen tube takes place on expenditure of food present in the stigma and style.
$R$ : Pollen tube travels intracellularly and chemotactically.
Function of filiform apparatus is to
Diagram showing entry of pollen tube to the embryo sac. Identify $A$ to $G$ in the diagram
Give information about compatible and incompatible pollen.