Here's why:

* Monera Kingdom: This kingdom includes all prokaryotic organisms, meaning they lack a true nucleus and other membrane-bound organelles. Bacteria, including Gloeocapsa, fall into this category.

* Prokaryotic Nature: Gloeocapsa are single-celled organisms with a simple structure, lacking a defined nucleus. They have a cell wall, cytoplasm, and a single circular chromosome.

While Gloeocapsa is a type of cyanobacteria, it is still classified as a bacterium and thus belongs to the Monera Kingdom.