You'll love this answer: Bacteria are haploid, however following a gene transfer (such as conjugation), they can also be partially diploid (merozygote)
Are Bacteria Haploid Or Diploid?
Haploid and diploid deals with chromosomes. Haploid halves the chromosomes and diploid doubles it. If you really look at it. If diploid means to double then bacteria is diploid because it never halves itself. It always multiply itself every 20 minutes.