What is meant by double fertilization in flowering plants? 

What is meant by double fertilization in flowering plants? 

Double fertilization refers to occurrence two independent nuclear fusions during fertilization in the embryo sac of flowering plants.

During this process, two male nuclei are involved; one fuses with functional egg cell to form a diploid zygote; the other fuses with both polar nuclei to form a triploid nucleus, the primary endosperm nucleus.

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