Question: what is the chromosome number of endosperm?
Answer: The endosperm mother cell has two polar nuclei so it contains a total of 8 chromosomes. There are 7 cells in the embryo sac, one of which (the endosperm mother cell) contains 2 nuclei. The egg cell, 2 synergid cells and 3 antipodal cells each contain one nucleus with 4 chromosomes.