Step 1: Structure of egg apparatus.
The egg apparatus in embryo sac consists of one egg cell and two synergids, along with filiform apparatus present in synergids.
Step 2: Antipodal cells.
Antipodal cells are present at the chalazal end of the embryo sac and are not part of the egg apparatus.
Step 3: Conclusion.
Therefore, the part not associated with egg apparatus is Antipodal cells.