In female plants only one of the four nuclei at the end of meiosis forms an ovum- the otheres disintergrate.
In male plants the 4 haploid cells produced at the end of meiosis undergo another division, this time by mitosis, where each nucleus divides to give two haploid nuclei within the pollon grain. - one is known as the tube nucleus which controls the development of the pollon tube and the 2nd is known as the generative nucleus which will divide again to form two gamete nuclei.
Meiosis has two importantroles in biology. firstly it results in haploid cells, which are necessary to maintain the diploid number after fertilisation. secondly it helps create genetic variation among offspring.
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