The type of life cycle in which the haploid form is always unicellular is called a diplontic life cycle.

Here's why this applies to humans:

* Diplontic: In a diplontic life cycle, the dominant, multicellular stage is diploid (having two sets of chromosomes). This means that most of the organism's life is spent in the diploid state.

* Unicellular Haploid Stage: The only haploid stage in a diplontic life cycle is the gametes (sperm and egg cells). These are single-celled, and their sole purpose is to fuse and form a diploid zygote, restarting the life cycle.

Therefore, humans, like many other animals, have a diplontic life cycle, where the haploid form is always unicellular.

Note: There are other types of life cycles, like haplontic (dominant haploid stage) and alternation of generations (with both haploid and diploid multicellular stages), but these are not relevant to humans.