The male gametes of rice plant have 12 chromosomes in their nucleus. The chromosome number in the female gamete, zygote and the cells of the seedling will be, respectively

In female gamete of rice plant the chromosome number will be same as that of the male gamete (12). Zygote is formed by fertilisation of male and female gametes thus, the chromosome number will be 24 (2n). A seedling is young plant sporophyte developing out of embryo. So, chromosome number will be 24 (2n).