NEET 2018 Biology question

Double fertilization is

(1)Fusion of two male gametes with one egg
(2)Fusion of one male gamete with two polar nuclei
(3)Fusion of two male gametes of a pollen tube with two different eggs
(4)Syngamy and triple fusionCorrect

Answer: (4)

Solution

In angiosperms the pollen tube releases two male gametes into the embryo sac. One fuses with the egg (syngamy, giving the diploid zygote); the other fuses with the two polar nuclei (triple fusion, giving the triploid primary endosperm nucleus). The two events together are

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Question ID VK-092286