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a
Fusion of two male gametes of a pollen tube with two different eggs
b
Fusion of one male gamete with two polar nuclei
c
Fusion of two male gametes with one egg
d
Syngamy and triple fusion
answer is D.
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Detailed Solution
Since two types of fusions, syngamy and triple fusion take place in an embryo sac the phenomenon is termed double fertilisation, an event unique to flowering plants.