When a diploid female plant is crossed with a tetraploid male, the ploidy of endosperm cells in the resulting seed is:

Step-by-step solution

Female parent genotype =2 ~N =2 ~A Male Gamete formed = N = A Male parent genotype =2 ~N =4 ~A Male Gamete formed = N =2 ~A Endosperm is formed by the fusion of 2 polar nuclei (from female gamete) and 1 male gamete. Thus, the ploidy of endosperm =3 ~N = A + A +2 ~A =4 ~A (tetraploid)