The odd one is
Micropyle
Embryo sac
Nucellus
Pollen grain
Identify labelled part $'X'$ from the figure :
Tectum, baculum, foot layer are the different parts of
$A$ : The generative cell comes to lie freely in the cytoplasm of the tube cell.
$R$ : Cellulosic wall around generative cell is dissolved.
After penetrating stigmatic and styler tissues, the pollen tube usually grow down towards the egg because
Identify the structures marked $A$ to $F$ in the given diagram