In a fertilized embryo sac, the haploid, diploid and triploid structures are :
Antipodal, zygote and primary endosperm nucleus
Synergid, antipodal and polar nuclei
Antipodal, synergid and primary endosperm nucleus
Synergid, polar nuclei and zygote.
Antipodals are haploid structures, zygote is always diploid and the primary endosperm nucleus is triploid structure.