How many haploid nuclei are involved in double fertilization?
a) Four
b)Two
c)Five
d)Three

Dear student,

Double fertilisation includes fusion of a male gamete with egg cell to form the embryo.
It also includes fusion of 1 male gamete with two polar nuclei to form the endosperm.

Thus total 2 male gamete and 3 female gametes are involved.
Thus total 5 haploid nuclei are involved.
Hence option C is correct.

Regards