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a
Antipodal cells and remaining synergid degenerate after the fertilization.
b
The fertilization in which non motile gametes are carried to female gamete through pollen tube is known as siphonogamy.
c
Since two types of fusions, syngamy and triple fusion take place in an emrbyo sac, the phenomenon is termed double fertilization.
d
Three nuclei and three gametes participate in double fertilization.
answer is D.
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Detailed Solution
Five nuclei (2 polar nuclei, 1 nuclei of the egg cell, 1 nuclei of each male gamete)Three gametes involved in double fertilization are 2 male gametes and one egg cell.