Define the following terms:
$1.$ Egg apparatus
$2.$ Filiform apparatus

(N/A) In an ovule,three cells grouped together at the micropylar end constitute the egg apparatus.
The egg apparatus consists of two synergids and one egg cell.
The synergids have special cellular thickenings at the micropylar tip called the filiform apparatus,which guide the entry of the pollen tube into the synergid.