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a
Two polar nuclei in central cell
b
Male gamete and one polar nucleus
c
Male gamete and two polar nuclei
d
Male gamete and female gamete
answer is D.
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Detailed Solution
Double fertilization = Syngamy + Triple fusionDuring syngamy, one male gamete cell will fuse with egg cell to form zygote.During triple fusion, one male gamete fuse with two polar nuclei in central cell to form primary endosperm cell (PEC).