The structures which guide the pollen tube into synergid is
Antipodals
Germ pore
Aril
Filiform apparatus
The embryo in sunflower has
Rose plants produce large, attractive bisexual flowers but they seldom produce fruits. On the other hand a tomato plant produces plenty of fruits though they have small flowers. Analyse the reasons for failure of fruit formation in rose.
$A$ : Complete radicle is not produced by hypo-basal tier of octant embryo during Cruciferad development.
$R$ : Hypophysis cell of suspensor contributes the tip of radicle in this type of development.
Collar like outgrowth arising from the base of ovule and forming a sort of third integument is known as
Adventive polyembryony is common in