The term that describes cells containing only a single set of chromosomes is haploid.

Here's why:

* Haploid refers to a cell or organism that has only one set of chromosomes.

* Diploid refers to a cell or organism that has two sets of chromosomes.

Examples of haploid cells include:

* Gametes (sperm and egg cells) in sexually reproducing organisms. These cells fuse during fertilization to create a diploid zygote.

* Spores in some plants and fungi.

Let me know if you have any other questions!