Answer:
We know the process of mitosis produces diploid cells because as a result of mitosis, identical cells are formed as the parent cell. This shows that the daughter cells are also diploid just as the parental cell.
We know the process of meiosis produces haploid cells because after fertilization, the number of chromosomes in maintained and genetic stability is achieved. The genetic stability can only be achieved if the number of chromosomes become haploid in the sex cells.