Question

after a sperm nucleus fuses with the two nuclei in the central cell of the embryos sac, a ____ nucleus is formed, which divides to give rise to the endosperm.
o hexaploid
o haploid
o triploid
o diploid

Explanation:

In angiosperms, double - fertilization occurs. One sperm fuses with the egg to form a diploid zygote (which develops into the embryo), and the other sperm fuses with the two polar nuclei (in the central cell) to form a triploid endosperm nucleus. The endosperm nucleus is triploid (\(1 + 2=3\), where the sperm has a haploid (\(n\)) genome and each polar nucleus has a haploid (\(n\)) genome).

Answer:

triploid