The main functions of the synergids are:
The chemical substances secreted by the filiform apparatus of the synergids helps in attracting the pollen tube towards the embryo sac.
The degenerating synergids act as a site of the discharge of the male gametes of the pollen tube.
In certain plants the synergids function as haustoria. The filiform apparatus of the synergids helps in the absorption and transfer of the nutrients from the nucellus into the embryo sac.