Answer:
The pollen grain which contains 3 haploid nuclei (2 sperm nuclei and 1 tube nucleus) for the male and the carpels which carry the ovary containing the ovule which further undergoes meiosis to produce an ovum/haploid egg cell for the females.
Explanation:
During fertilization,one of the two sperm nuclei inside the pollen tube fertilizes the ovum to form the embryo/seed. The second sperm nucleus fertilizes the diploid pollar nucleus to form the triploid (3n) endosperm. This is known as "double fertilization" which occurs only in angiosperms and not in gymnosperms.
