Monera is a bacterial kingdom that includes bacteria that are photosynthetic autotrophs.
Diverse photosynthetic organisms, which can photosynthesize and obtain energy, belong to this kingdom.
Since photosynthesis requires light, all oxygenic photosynthetic monerans are photolithotrophs.
The peptidoglycan layer in cyanobacteria's cell wall serves as a suitable model for oxygenic photosynthesis.
Some monerans are autotrophic, which means they produce their own food either through photosynthesis, like purple sulphur bacteria, or chemosynthesis, like the nitrifying bacteria in the nitrogen cycle.
Others are heterotrophic, surviving as parasite bacteria that feed on a living host while usually causing harm to it or as saprophytic decomposers that consume decaying organic waste present in the soil.