Question

difference between haploid and diploid

Answer 1

When the male and female gametes fuse during fertilization and zygote formation, the chromosome number is restored to 2n again. Thus, diploid cells are those which contain a complete set (or 2n number) of chromosomes whereas haploid cells are those that have half the number of chromosomes (or n) in the nucleus.

Answer 2

haploid means 1 set of chromosomes.
diploid means 2 sets of chromosomes.