Triple fusion is the fusion of three haploid nuclei, which results in the formation of triploid endosperm in the flowering plants.
In flowering plants a pollen grain carries two male gametes.
One of the male gametes fuses with the egg cell to form diploid zygote.
The other male gamete fuses with two polar nuclei, located in the central cell, that forms an endosperm within the seed. Thus, there is fusion of three haploid nuclei called triple fusion.
Triple fusion occurs in the embryo sac of the ovule within the ovary.
The nuclei involved in polar nuclei are two polar nuclei and the male gamete nuclei.
Final Answer
Triple fusion is the fusion of three haploid nuclei (two haploid polar nuclei + one male gamete nuclei), which results in the formation of triploid endosperm in the flowering plants.
Triple fusion occurs in the embryo sac of the ovule within the ovary.
The nuclei involved in polar nuclei are two polar nuclei and the male gamete nuclei.