if the endosperm cell of Pinus contains 12 chromosomes,then that will be the chromosome number in its megasporophyll,pollen,embryo,root respectively?

In Pinus endosperm is n, megasporophyll is 2n, pollen is n, embryo is 2n and root is 2n. Therefore, if the endosperm contains 12 chromosomes then megasporophyll contains 24 chromosomes, pollen has 12 chromosomes, embryo and root will have 24 chromosomes.