Endosperm is the result of
Single fertilisation
Partial fertilisation
Double fertilisation
Triple fertilization
Branched type of pollen tube is formed in
The largest cell of the mature embryo sac is
In Capsella meiosis takes place during
$A$ : Certain proteins of pollen origin identifies the compatible stigma.
$R$ : Compatibility proteins are found located in ektexine.
Collar like outgrowth arising from the base of ovule and forming a sort of third integument is known as