$A$ : Filiform apparatus guides the pollen tube into the synergids.
$R$ : It is special cellular thickening at micropylar tip to secrete chemotropic stimulus.
The number of mitotic generations required to form a mature embryo sac in most of the flowering plants is
Tegmen develops from
In which type whole of the megaspore mother cell takes part in the formation of the female gametophyte
Choose the odd one w.r.t. gynoecium.