How many nuclei take part in double fertilization of flowering plants?
a)	3	b)	2	c)	4	d)	8

(c)

Double fertilization is characteristic feature of angiosperms. It is a fusion of two male gamates brought by a pollen tube to two different cells of the same female gametophyte to produce zygote and endosperm. A total of five nuclei takes part in double fertilization (sometimes called four as the two polar nuclei fuses to form one).