Question

Primary endospem nucleus (PEN) is formed by the fusion of

(a) 2 polar nuclei + 1 synergid cell nucleus

(b) 1 polar nucleus + 1 antipodal cell nucleus + 1 synergid cell nucleus

(c) 2 polar nuclei + 1 male gamete nucleus

(d) 2 antipodal cell nuclei + 1 male gamete nucleus.

Answer 1

Correct option (c) 2 polar nuclei + 1 male gamete nucleus

Explanation :

During the event of double fertilization in angiosperms, the second male gamete fuses with the two haploid polar nuclei or diploid secondary nucleus of the central cell to form a triploid primary endosperm nucleus (PEN). This second fertilization is called vegetative fertilization.