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a
one male gamete, one polar nucleus and an egg cell
b
one male gamete and two egg cells.
c
one cell of male gametophyte and two nuclei of female gametophyte
d
two male gametes and a secondary nucleus
answer is C.
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Detailed Solution
Triple fusion is unique to Angiosperms in which there is involvement of one male gamete released by pollen tube and the two polar nuclei of central cell of embryo sac to form a triploid primary endosperm nucleus that forms the nutritive tissue of seed known as endosperm.